Yeah, I've got a huge backlist of unfinished games on Wii. Right now I'm working my way through Zelda: Skyward Sword - just made it to the second temple, bought it day one - that gives you an idea how much playtime I actually get.

Also have to finish: Xenoblade, The Last Story, have Pandora's Tower and Project Zero 2 on pre-order. That's my entire year for sure and likely then some. But I still haven't finished RE4, Super Mario Galaxy, Fire Emblem, Etc., etc., etc.

Funny thing is I have a 360 right here that I refuse to even acknowledge cause I don't want to start buying games for another system, especially all the WRPGs, which is exactly what I'd get... and never finish.

My List of unfinished games.

PC:
* Anno 1404 - I'm so noob at this, I just spend a few hours and quit.
* Anno 2070 - Same as above.
* Arcania - Gothic 4. - Played for 5 minuets.
* Arma 2. - Never played.
* Assassins Creed - Played for a few hours, never picked it up again.
* Assassins Creed 2 - Played for about 5 minuets, saw it was more of the same.
* Batman Arkham Asylum. - Lost my save file, which killed it for me.
* Blur - Derp.
* Borderlands - The Cell shading art killed it for me.
* Brothers in arms: Earned in blood. - Been telling myself I will complete this one of these decades.
* Call of Duty 1. - Thought it was a fairly average game. Managed to get a few levels done.
* Call of Duty 2. - Again, only an average game, was a fun ride, did a couple of levels.
* Call of Duty: Modern Warfare 3: At this point in the franchise, it was just more of the same. More milking of a horrible story with the same graphics, don't know why I expected any different. Will be the last time.
* Crysis. - I've launched this game a few dozen times. Great benchmark. Might play it one day.
* Crysis Warhead. - Same as above.
* Crysis 2. - Same as above.
* Dead Island. - I love zombie games. This one just didn't grab my attention like left 4 dead.
* Deus Ex 1: - I got up to the part where a guy was taking a leak on the wall. Laughed, never played it again.
* Deus Ex 2: - Played for a few minuets, hated the console interface and controls.
* Deus Ex 3: - Bought it on release. Still haven't played it.
* Dirt 3: - Got this one bundled free with an old Radeon 6950 2gb card. Still haven't played it.
* Dragon Age 2. - My god. Horrible. Got a little way through, never again. Horrible Horrible. Stick to Origins.
* Driver: Parallel Lines. - I'll be honest, I didn't even know I bought this.
* Morrowind: Loved this game, spent hundreds and hundreds of hours. Yet never finished it "properly".
* Skyrim: Bought in on release day. Crash to desktop every time. Never touched it again for a few months. Then when a patch came out that fixed my issue, no eyefinity support, console interface and controls instantly put me off for good.
* Fable 3: Already owned it on Xbox. But meh. Doesn't hold a candle to the first game in my eyes.
* FarCry 1: This was a great benchmark back in the day, which is all I ever used it for.
* FarCry 2: Just never could get into it.
* From Dust: Great little game, for a level or two. Then it's repetitive.
* Grand Theft Auto 3: Hated it.
* Grand Theft Auto Vice City: Hated it.
* Grand Theft Auto San Andreas: Hated it.
* Grand Theft Auto IV: Hated it, You would think I would have learned by now. But I keep hoping one of these games might be more to my taste one day.
* Half Life - I only ever played this game for the mods.
* Half Life 2: Played for a few levels, then mods took over.
* Heroes of Might and Magic V - Bought it, installed it. Never played it.
* Heroes of Might and Magic VI - Played the crap out of the beta. Never touched the final release though.
* Homefront. - I don't think this needs any explaining... It's best aspects are only average.
* Just Cause 2: - This just felt like a glorified GTA to me. Hence why it probably didn't "click".
* Mirrors Edge. - My god, what a fantastic game. Got to a part where I just couldn't progress. So shelved it.
* Medal of Honor: - Bought this a few years back, always intrigued me. Might try it.
* Men of War: Herp.
* Metro 2033. - Great benchmark, all I used it for unfortunately.
* Need for Speed: Shift: It's not what underground was. :( Lost interest in it quick smart.
* Neverwinter Nights 2: I'll be blunt. The first game was fantastic, I just don't seem to be able to get into this one.
* Red Faction: Played it only for the multiplayer. Which was fantastic back in the day.
* Red Faction 2: Never played it, just haven't gotten around to it yet.
* Sacrifice: Loved this game years ago. Truly an original RTS game, but never did do the story.
* The Settlers 7: No idea why, I only played the second game and loved it. Played this for a little while and never touched it again.
* Civilisation V: This game is just way too long and drawn out, my patience not such much. :(
* Sins of a Solar Empire: A single match can last for 10's of hours, because of such. I've never managed to finish a round.
* Supreme Commander 2: Just didn't seem to hold up with me as well as the first game.
* Test Drive Unlimited 2: Probably bought this on a sale.
* Titan Quest: I actually thought I had completed this at one point while playing it, then I realized I only made it 1/4th the way through. Never touched it since.
* Shogun 2: Bought it, ain't played it yet! Everyone keeps telling me it's good.
* Tropico: - Bought it because it looked good, ain't played it because... Too many other more interesting games.
* Two Worlds 2: Bad.
* Warhammer 40,000 series: Dunno why I ain't played this yet.
* Total Annihilation: Loved this game back in the 90's. StarCraft unfortunately took over once I was about half way through.
* Battlezone 2: I admit, I prefer the base building in instant action than the campaign.
* Dark Reign 2: The first game was far superior, the disc was shelved indefinitely.
* Bullet Storm: Lots of pretty effects. Not much substance too the story for me.
* Gears of War 1: Have it on Xbox. But the first game just didn't click with me like the other two.
* Dungeon Siege 3: Ain't even played it yet.
* Freelancer: This game was to put bluntly... Awesome. However everytime I got about half way through, something would happen, like a reformat or I make a new character or I pick up another game.
* Duke Nuken forever: Horrible.
* Freespace 2: This game just overwhelmed me. Used to play it avidly for the mods.
* Black and White 2: Great game, unfortunately the story wore me a bit thin.
* Dungeon Keeper 2: Awesome game. Completed the first game, never managed to complete this game because I eventually upgraded to Windows XP - Windows 7 which this game never agreed with.
* Emperor Battle for Dune: - I loved the books, movies, Dune 2000 yet this one just couldn't keep me entertained during the campaign, although multiplayer was a blast.
* Homeworld 1 and 2: From what I have seen of the story in the first few hours of both games seems fantastic, yet I prefer multi-player. (Where is the 3rd game!?)
* Jurassic Park: Operation Genesis. - I felt let down by this game. I ended up shelving it in the hopes of a mod to fix up all my qualms.
* Spore: Has to be the most hyped game of all time, I expected more from it, but as soon as I got to the tribal age, that was it. Was far to simplistic.
* Evolva: This game blew me away, I eventually got to an area where I couldn't progress and I ended up shelving it.
* Battlefield 3: Amazing graphics, makes a great benchmark. Story is about as good as tasting molasses.
* X3 series. - You need several phone books of instructions just to play it!
* L.A. Noire: - Got to a point, where I just couldn't be bothered with the boring missions.
* Rage: Major let down, got a couple hours into it.
* Chronicles of Riddick: It wasn't too bad, obviously wasn't good enough to keep my attention though.
* The Witcher 2: Just been leaving this one for when life ain't so busy so I can enjoy it to it's fullest.
* Serious Sam 2: Made a great benchmark once upon a time. Which is all I played it for.

Xbox 360:
* Command and Conquer Tiberium wars: - Horrible controls, never got past the first level.
* Assassins Creed: - Had the same problem here as on the PC.
* Soul Caliber IV: - Never played it. Looks nice in my shelf though.
* Star Ocean: The last hope: - Despite this games flaws, I got fairly far into it and then got stuck.
* Viva Pinata: - Derp.
* PREY: - Great concept. But I got tired of the dullness.
* Final Fantasy XIII - Got to a point where it felt the difficulty increased 10 fold, so ended up shelving it.
* Banjo Kazooi Nuts and Bolts: - Herp.
* Aliens vs Predator: - Got this on Xbox and PC. PC was far superior graphically. So completed it on that instead.
* Saints Row 2: - Reminded me of GTA far too much.
* Assassins Creed 2: - Just more of the same.
* Gears of War: - Just couldn't get myself into it.
* Guitar Hero: - Played it a few times, it's gathered allot of dust since then.
* Need for Speed: Pro Street. - I need to stop expecting more Most Wanted or Underground games.
* Bad Company 2: - Superior on the PC in every way, but wanted it so I had the first and second game on the same platform.
* Ninja Gaiden 2: - Not my kind of game.
* Mirrors Edge: - Same problem I had on the PC. :(
* Perfect Dark: Zero. - Couldn't hold a candle to the original, Rare killed this franchise I think.
* End War: - Voice commands! Wooo! Pity they have troubles with some phrases in my Australian accent which caused endless frustrations, the graphics leave much to be desired too.
* The Last Remnant. - Might get around to playing this eventually.
* Gears of War 3: - Still sitting in it's plastic since launch.

I know I have a box full of old PC games from the 95ish era and Xbox 1, N64, SNES, NES, Game boy, Gameboy Colour, Nintendo DS games that I could potentially add to the list.
But generally, I see a game, if I don't have it I usually buy it.
And currently I own zero games for the PS3, just use the console as a Blu Ray player, might pick up the Uncharted series one of these days.

I think I've never had more than 2 games I've started playing, but not finished. The only ones I've not finished (and never will) this gen, are Saint's Row 2 and Demon Souls. I have about 80 games so it's a pretty good ratio :)

I'm currently playing Brütal Legend and Trine 2, my next purchase will be Alan Wake for PC (don't have a Xbox)

I have 136 games that I haven't finished, and those are just onsteam I don't want to count retail games because I'll probably spend all day just counting them, so anyone care to break my record?

Not big enough

Wow. I have very few games I haven't finished.

From this gen:

Demon's Souls (I don't know why, I was on the last stage when you have to run to avoid the dragon's fire, I'm pretty sure I'm very close to the end. May finish it one of these days).

Valkyria Chronicles: I think I'm about 60% through. It's original and fun, but I get bored when I fail a mission too many times after several hours trying, I must not be very good at the game.

Siren: Blood Curse: I tried it, but it was so dark that I didn't know where I was going, that frustrated me.


That's it for me!

Hah, I feel bad whenever I buy a new game without having finished the last one I'm a reading whore, though, so I don't play games for more than 2 hours a day. Good to see so many people having huge backlogs.

That's my little backlog for now:

Dragon Quest IX (DS) - Guess I'm about 80% through. Maybe 90%. No idea why I haven't finished that one yet.
Apollo Justice: Ace Attorney (DS) - probably halfway through the game. It's nice but I can only play it in small doses.
Skyrim (PS3) - You must be out of this world to finish Skyrim properly. About 30 hours in and I play it regularly.
Uncharted 2 (PS3) - For some reason I never play this game even when I'm bored. What the...?
Super Mario Galaxy 2 (Wii) - I have 50 stars and the game is fun. Should be doable. I just bought it a week ago.

Debatable:
Super Mario 3D Land (3DS) - I'm in Special World 4 right now but I want to save some of the fun for longer trips.
Zelda: Skyward Sword (Wii) - Second playthrough is boring. I mean boring. Maybe in a year or two. Not right now.

And some of the free stuff I got for my 3DS and PSP:

The 10 free games that came with my PSP Go (finished some of them, started some more... but I'm only interested in half of them, so yeah...) and some of the 3DS Ambassador games (which I'm actually playing my way through, at least the good ones).

 Then there's some NES games I could never beat but yeah...

In general I don't feel bad for not finishing games I don't like. If a game is boring it's not worth my time and thus won't be considered part of my backlog anymore (this could very well happen with Apollo Justice if the game doesn't spice things up a bit in later chapters). Also, stuff like those 120 green stars in Super Mario Galaxy don't count. If I get the 120 regular ones I finished the game. I won't complete dozens of hours of side quests to get... nothing in most cases.

Also whenever I play more than 2 games at once I get what I refer to as a "content overload": I can't decide which game to play so I just play neither or focus on one of them. Doesn't make sense? Yeah, I know but it's a quite well documented consumer behavior, actually. Same thing happens when a single game offers too much to do. Think of the 500 Street Fighter characters or the Yakuza side missions someone mentioned earlier. It just blows your mind and you give up. For this very reason I sometimes wish we were back in the mid-90's when you could buy a game for your Gameboy and 100% complete it in a single week. You'd still get a lot of content and the game wouldn't get boring. Rather you'd want to play more of it and most of the time there'd be a sequel after a year or so. Yearly sequels were cool on the Gameboy (Wario Land!) but I don't feel like playing through an epic series like Assassin's Creed each year.

Thanks everyone for your replies. Good to see I am not alone with a lot of unfinished games. The problem is that when I buy a game, I am all hyped up for it. I play it a lot and then, I begin to loose some interest. If I stumble across a game that I might enjoy and if the price is right, I'll usually pick it up, almost never touching the other one again.

The last game I bought is Singularity. I got it for 15$, brand new. I started playing right away, leaving my Silent Hill HD collection take a break. I then started thinking that I never got around to play the first Mass Effect. Started doing some research on the web and so forth. Usually, I would of gone out and pick it up. But not this time. I will finish Singularity. After that, I am hyped for Silent Hill 3 and Homecoming. And I want to start Divinity II again.

One game at a time.

My list of unfinished games:
X360:

Skyrim: Played a few hours, will get back to it.
Gears of War 3: Played a little and will get back to it.
Red Dead Redemption. Have not played yet.
Alan Wake: Have not played yet.
Resident Evil 5: Played a little but will need to finish later.
Lost Odyssey: Played a little but did not like it.

PS3:
Prince of Persia: Played a little and did not get into it.
Gran Turismo 5: Played a little and will get back to it.
Uncharted 3: Have not played it yet.
God of War: Played for a few hours but lost interest. Will finish later.
Mass Effect 2: Already played and completed this game on X360 but will play this in PS3 later on.

Well I will play through most of these unfinished games before I buy anymore games. I regard finishing a game is when the last level has been completed.

Before the fifth gen, I wouldn't even buy another game until I had finished the game I already owned--even if that game was IMPOSSIBLE. The only exception was if it was a game that had no ending. During the N64 era, I'd always finish my N64 games but I'd have two or three PS1 games lined up. I'd eventually finish them, though. My problems started during the PS2/Gamecube era.

During that era, I was buying games left and right. I still finished probably 90% of them. Then this gen came around. I argue that games are better than they've ever been but looking at my unfinished titles, maybe I'm wrong about this one.