1. Star Ocean: The Last Hope- I haven't finished this game, so I'll let that speak for itself.

2. Halo 3: ODST- Yeah, firefight rocked!

3. Forza Motorsport 3- Yeah, best racing game I've played.

4. Mass Effect 2- Probably my GOTY last year.

5. Final Fantasy XIII- Haven't finished it either.

6. Tom Clancy's Splinter Cell: Conviction- Campaign was ok. Co-op is great!

7. Alan Wake- Yeah, awesome game.

8. Halo: Reach- I love this campaign! I need to play it again.

9. Fable III- I put 40 hours in this, so yeah!

My day ones this year:

1. RAGE

2. Gears of War 3

3. Battlefield 3

4. Skyrim

Super Mario Galaxy 2 - not worth it, great game but i could get it cheaper now than when i bought it day one
Super Mario Galaxy 1 - same as the above
Metroid Prime Trilogy - again same as above, only this was supposed to be limited, i've seen it plenty of times new, and cheaper than what i payed for it.
Arkham Asylum- if i would have waited a few months i could have gotten a cheaper copy, with 3D and more LDC challenge maps
Punch-Out!! - payed almost €60, great game but again, now i can get it for less than €25 
Super Smash Bros Brawl - not worth it, i'm not a fan of fighting games, mostly because i dont know anyone that likes them, so when i heard this would have multiplayer i was excited, but then i found out how much it sucked.

i mostly regret all day one purchases this gen since they drop in price really fast, and most HD games you get a gimped version if you buy it day one, better wait for the GOTY/Complete edition that usually comes with all the extra content.

Most of my PS3 game purchases are First day, unlike my 360 or PC games which are normally months after release.

Xbox 360

Halo: Reach - Yes probably the best FPS released this gen
Gears of War - Yes, One of my all time favorite games
Gears of War 2 - The best TPS of all time and in my personal Top 10 list
Ace Combat 6 - Not as good as the PS2 mainline games, but still a fun game

PS3
Call of Duty 3 - My man source of online gaming in the early years of PS3,  good game but not great
Resistance: Fall of Man: Probably the most underrated FPS on PS3, 
Heavenly Sword  -  One of my favorite Hack n Slash games this gen,  really hoping for a sequel
Devil May Cry 4 - Not as good as the previous games
LittleBigPlanet - Absolute pure genius,  one of the most fun title I have played
Call of Duty 4 - Last COD game I bought,  since they havent changed since this one,  Still the best they ever made
Metal Gear Solid 4 - One of the greatest endings to a Game series I have ever experienced,  still gives me chills
MotorStorm - Good racing game that was fun and extremely frustrating at times
Unreal Tournament III - Not the best UT game, but still alot of fun, especially with friends
Warhawk - To date probably the best Online experience to be had on the PS3
Lair  -  Not as bad as everyone says,  not as good as it should have been.  The concept had such promise
Valkyria Chronicles - One of the few games to make me cry,  a brilliant game and a great story. A Must have game
Need for Speed Carbon - The last Need for Speed game that I played that is worth a damn, 
SOCOM Confrontation - Bought mainly for Bluetooth headset,  game wasnt worth the $20
Fight Night Round 3 - One of the best boxing games I have played
Madden 07 - Good football game,  but the last I will buy due to gaming interests changing
Resistance 2 - A step back from the previous game, but did improve some things as well,  Good solid FPS
Timeshift - Fun FPS game,  well made just not spectacular.   
Fallout 3 - My favorite WRPG this gen,  buggy at first but fixed in a timely manner
F.E.A.R. - Scared the crap out of me,  Good game, solid FPS and great scare parts as well
Rock Band 2 - Still my favorite Music/Rythym game 
Tom Clancey's GRAW 2 - Another good Tom Clancey game,  they know how to make good military shooters
Dead Space - Fantastic game, great lighting and sounds,  one of my favorite horror games this gen
Killzone 2 - Absolutley stunning game with a great online community,  spent countless hours online
Tom Clancey's HAWX - Got burned on this one,  was expecting an Ace Combat type game, didnt get one
inFamous - The best sandbox game available on PS3,  awesome story with some cool twists
F.E.A.R.2 - Such a let down after the first one,  seemed to go more Sci-Fi than horror
Batman AA - Finally a comic book game that not only doesnt suck,  but is f'n awesome
Brutal Legend - A must have for any Heavy Metal fan,  lots of fun with great music
Uncharted 2 Among Theives - Arguably the best game to release in 2009
Borderlands - 8 playthroughs, 16 if you count 2nd playthroughs, over 400 hours and 9 million weapons later. Oh Yeah
Ratchet and Clank A Crank in Time - Beautiful game, outrageous weapons, everything you would expect from R&C
God of War Collection - The best Hack n Slach games from PS2 as HD remakes,  worth every penny
Dante's Inferno - God of War wannbe,  but still a good game, even if it doesnt quite follow the story the way it should.
Heavy Rain - My game of the Generation
God of War III - The epic ending to a great series,  Best looking game on any console, and awesome to play as well
Medal of Honor - Good game but too short,  better than the COD games that were released recently
Fallout New Vegas - Fantastic game once you get past the bugs,  but the problem is you cant at times
Gran Turismo 5 - Best GT game ever, and best Racing game on consoles
Dead Space 2 - Took what was great on the original and improved it,  one of my favorite series this gen
Killzone 3 - Second only to Halo Reach for best FPS this gen,  and its crazy in 3D
LittleBigPlanet 2 - Oh the amount of things to do in this game is unreal,  all the new gadgets added are awesome,  another great game from Media Molecule
SOCOM 4 - I Dont know yet as I havent played it,  but it has 3D and thats promising
Portal 2 - Fantastic game, fantastic humor,  and great puzzles that make you think,  would love to try out that co-op feature I hear it has

God of War 3: God of War series is one of the two  reasons I Iove Playstation. So, getting God of War 3 day one was a must for me. It wasn't the masterpiece I'd hoped it would be, but it was still great. Glad that I got it day one. With the GOW Collection, it has  a very valuable place in my archive.

Gran Turismo 5: The other one of the two reasons is the Gran Turismo series. After waiting so much time, I had to buy it. Racing part was superb, but the rest of the game was a bit meh. Overall I am happy though.

Uncharted 3: I have it preordered since the day it was announced. Can't wait!

Hmm, I have a lot of games but it seems I don't like to pay full price for them lol.

Nice thread Mr. Lewis!

Anywho...

DS:

• New Super Mario Bros.: 5/15/06 (When a new Mario game comes out, I'm there. When a new 2D Mario comes out... well I'm doubly there!)
• Pokemon Diamond: 4/28/07 (What can I say? I'm a Pokemaniac at heart and DS' first Pokemon release was up there on my hype list. More than 250 hours later, the game has not disspointed!)
• Pokemon SoulSilver: 3/14/10 (Another day, another Pokemon game I had to get the day it came out.)
• Pokemon Black: 3/6/11 (Are you seeing a pattern here? When a mainstream Pokemon game is announced, I'm there day one. Black is a fantastic game (120 hours in so far) and I'll be there for the next generational Pokemon too!)

Wii:

• The Legend of Zelda: Twilight Princess: 11/19/06 (Wii had a couple of launch games that interested me... but Twilight Princess was the game that I had to have! This and Wii Sports really made the Wii launch shine.)
• Rayman Raving Rabbids: 11/19/06 (Another Wii launch game, this game was a bunch of mini-games made awesome by the zaniness of the Rabbids. I love those guys!)
• Red Steel: 11/19/06 (This was the game that you had to have with the Wii. I mean... shooting guns was cool, but sword fighting with the WiiMote? Awesome! Unfortunately, the game didn't deliver! Boo!)
• Dragon Ball Z: Budokai Tenkaichi 2: 11/19/06 (I got four games when the Wii launched, and Budokai Tenkaichi 2 was one of 'em. The game was pretty darn fun, and gesturing the Kamehameha was awesome.)
• Sonic & the Secret Rings: 2/20/07 (Wii's first Sonic game and it would be mine! The game was different, but it was still very fun!)
• Metroid Prime 3: Corruption: 8/27/2007 (This was the first game I bought when I went off to college, and it was an awesome experience.)
• Super Mario Galaxy: 11/1/07 (The second best game of the generation for me. Like I said before, when a new Mario game comes out, I'm there!)
• Super Smash Bros. Brawl: 3/9/08 (The Smash Bros. series is something to get excited about. Its a game that holds so many beloved Nintendo characters [Sonic and Snake made the game even sweeter!] and it only comes out once a generation. So yeah, It released during my Spring Break... was there day one, and it was awesome!)
• Sonic & the Black Knight: 3/3/09 (I love Sonic games. It's who I am! So I got Black Knight on day one seeing as Christmas was past and my birthday wasn't until a couple more months. It was a good game, but not great.)
• Metroid Prime Trilogy: 8/24/09 (The game came out on my birthday, so of course I was going to get this day one! Doesn't hurt that it was a collector's series, and I wanted to get it as soon as possible!)
• New Super Mario Bros. Wii: 11/15/09 (So what if Christmas was right around the corner, I would be playing this game as soon as I could, and that was the first day it released!)
• No More Heroes 2: Desperate Struggle: 1/26/10 (I loved the zany, violent, and hilarious world of Travis Touchdown, and I wanted to be there day one for his next adventure. Great game!)
• Super Mario Galaxy 2: 5/23/10 (Galaxy was my second favorite game of the generation, this game is my 1st favorite. I'll always be there for a new Mario game!)
• Metroid: Other M: 8/31/10 (Metroid games usually come out right around my birthday, so having the money to get them day one isn't too difficult. It was a good game, but I was slightly disappointed with Samus' adventure.)
• Epic Mickey: 11/26/10 (Being so close to Christmas, I only wanted to get one game... and it was either Donkey Kong or Mickey, and I chose Mickey. I don't think I made the wrong decision either, as Epic Mickey was a game that took place in my childhood's imagination. Fantastic game!)

3DS:

• Super Street Fighter IV 3D Edition: 3/27/11 (This is the only launch title I got with my 3DS, but the game is still great!)

Halo 3 -- Totally worth it!

Halo Reach -- Worth it.

Bulletstorm -- Not worth it

Fable 2 -- Worth it

Fable 3 -- Worth it

Halo Wars -- Only semi worth it because I got the Mythic map pack for Halo 3 a month early

Fallout: New Vegas -- Not worth it

Two Worlds 2 -- Worth it

Lost Planet -- Not worth it

Mass Effect 2 -- So so so so worth it!

Guitar Hero World Tour -- Worth it

Rock Band -- So worth it

Rock Band 2 Very worth it!

(^^) means i'd rebuy it 10 times day one ^^

day one... not that many, but mostly N games as price doesn't drop as much.

MKWii (^^)

MOM (still early in the game despite the time.... i like it and well would rebuy any metroid day one independent of quality anyways)

SMG (^^)

SMG2 (^^)

MsportsMix (was worth it cause the GF likes it... probably way too easy though)

NSMBWii (^^)

Punch Out (^^)

WiiSR (^^)

Brawl (yeah ^^ though like the op, played it only 2 some)

Wii Fit (heck yeah, GF loves it and the games are cool too)

GSTennis (yeah fun, first WM game for me... still play from time to time)

TatsunokoVsC (heck yeah! hadn't played a fighting game in 5 years too, so double yeah!)

Conduit (.... no... though I didn't try the online.. I play my FPS on PC and the gap is just too great).

360:

Gears2 (^^)

GTA IV (^^)

Perfect Dark (XBL... barely played it :p)

PC:

MW2 (made me reinstall Steam... and consequently start playing PC games again... blame WoW :p... was good but I prefer UT/CS types).

CIV V (^^)

SC2 (^^)

M&B WB (^^)

M&B FS (^^)

S8P

Brink (releases on 13th here)

Breach (yeah was great fun... for the 15 hours I played.... but crashed on server connect and communoty after 3 weeks was kinda gone)

AVP (I like it... but somehow even close to release I barely found anyone online...)

3DS:

SSFIV 3D (^^)

Monkey Ball (meh... first MB I play but i'm not a fan... maybe it's because of the tilt controls? i'll try stick)

PSP

Syphon filter (great game... didn't finish it though)

Wii

• Donkey Kong Country Returns
• Super Mario Galaxy? Not sure.
• Super Paper Mario

PS3

• Metal Gear Solid 4
• LittleBigPlanet
• Batman: Arkham Asylum
• Demon's Souls
• Uncharted 2: Among Thieves
• Borderlands
• Call of Duty: Modern Warfare 2
• White Knight Chronicles: International Edition
• Heavy Rain
• Final Fantasy XIII
• God of War 3
• 3D Dot Game Heroes
• Red Dead Redemption
• Transformers: War for Cybertron
• Atelier Rorona: Alchemist of Arland
• Call of Duty: Black Ops
• You Don't Know Jack
• Portal 2
• L.A. Noire (pre-ordered)
• inFamous 2 (pre-ordered)

The only disappointments are Super Paper Mario, Borderlands and White Knight Chronicles.

well i got god of war 3 one week before it released but thats it.

I hardly go into the store on day one, since the internetz is cheaper and sadly they can hardly make sure I have it day one. 

So if playing it strick on the day one time-frame it's:

Killzone 2 - worth it

Killzone 3 - not so much