In order from best to worst:

Wii - Lacks raw power, and has lots of crappy games for it. However, Wii offers the best games of this generation and has also the most diversity. Controls are much better than conventional dual analog controllers. Free online, but a bit crippled at the moment. Best choice for local multiplayer.

PC - Has a huge library of great games. Natural fit for RTS and FPS games, as well as point and click adventures and other obscure genres. Steep hardware requirements for news games is a big problem, as a hardcore pc gamer needs to upgrade every 2 years.

360 - Very powerful console with a good games library. Online is awesome, but costs a lot of money in the long run. Genres are a bit unbalanced (too many FPS games)

PS3 - Very powerful console with a lot of potential. Free online is rock solid. Lack of good games make it hard to recommend to any serious gamer.

PC - As ever, the hydra of gaming: massive, all-encompassing, and downright overwhelming. Both in potential experiences and in the price it costs to keep a PC up to gaming standards. But it's still fun.

Wii - Most bang for one's buck, in terms of fun per dollar. Has quite a library of quality titles already, which seems easily missed by some. Then again, perhaps my standards are a little different, but I personally feel that 11 games worth owning at this stage in the system's life is nothing to turn one's nose up at. I haven't even half that many titles for my PS2 that came out between 2001 and 2002, yet I still loved my PS2 back when I got it in mid-2002.

360 - I see the potential, but I also see the more obvious problems: one, it's got hardware issues, and two, it's ultimately a PC with a controller instead of a keyboard and mouse. That said, it does have a few (currently) exclusive titles that do interest me, such as Eternal Sonata. Can't say much beyond that, as I don't have one and don't forsee getting one for some time, if ever.

PS3 - Even when you do get past the sticker shock, that's still a lot to ask for a game system. Potential is meaningless when it's not harnessed usefully, and as it stands, there are 0 PS3 games I'm interested in currently out, and only 2 on the horizon. Again, PS3 suffers from PC replacement syndrome, and since I have a gaming PC, I don't care for it.

DS - Solid library, interesting games, reasonable prices. A trifecta of victory, that. Little else needs be said.

PSP - While my DS and PSP libraries are equal in size, for the most part, my PSP library consists mainly of ports (both to and from the system). I'm sure that's not a good sign for the system, but if nothing else, the PSP is a great alternative to paying far too much money for rare PS1 games.

PC - Hundreds and hundreds of AAA titles, and it still keeps getting the biggest amount of good games nowadays (easily the best 2008 lineup). The best game versions, modding, customization and the best control scheme makes the PC Heaven for hardcore gamers.

Wii - Refreshing controls and Nintendo games. Lots of quirky games but the Wii still has ways to go to fulfill most of it's potential. My favorite Console this gen and it's also part of what I think is THE best combo Wii+PC.

PS3 - Not many exclusives that stand out, and you'll have to wait quite a bit for it's best games. I think by the end of it's lifetime it will be the console with the far fewer exclusives, making it the most unappealing console if you're looking for a secondary console. But if you have an HDTV you're set for a good Blu-Ray player.

360 - Dumbed-down PC. Xbox 360 is cheaper than the average PC but it's online fees and more expensive games will ultimately make it just as expensive as a PC+upgrade if you buy around 6 games every year. Might aswell buy a 800$ PC that will last you for years. However if you're a single-platform gamer and you don't want to play on PC, then Xbox 360 is your best bet.

PC - Ahh, my PC for FPS and MMOs... plus RTS and RPG! I really like the PC as a platform, but I'm moving slowly away from it as I just can't be bothered with the cost anymore and I feel that too many games are designed for console anyway now. Still, ignoring cost you've got best online (better than Live and free), best graphics, best contollers (i've got m/k, gamepad and a joystick hooked up to mine), best sound, best media centre and highest storage capacity (in general I mean vs default console options). Major downside is that its not as easy to sit on a couch with a friend for some coop fun.

360 - good games console, but for me a cut down PC to make gaming more afforable (not saying that's a bad thing). I don't like the way peripherals are handled (i.e. for me a console is a single unit, not lot's of bits bolted together) and I really don't like noise, heat, power brick and RROD factor (although these are getting better I guess). Great library of games but I worry only FPS/action games really seem to sell on the platform, and that if PS3/Wii start to outstrip the console for sales of RPG, platform type games it will lose major support for those kinds of titles. It's okay as a media centre but current limbo for HD playback hurts the attraction in my eyes

PS3 - good games console that combines solid tech with good media centre capabilities. Hampered somewhat by architecture (in terms of how this has impacted quality of initial games) and price, but both of these situations are now sorting themselves out. A little unsure what it wants to be in some ways, which I guess puts some off. For me the console of choice next to my PC as I wanted HD gaming plus HD movie playback, so while 360 was initially in the running its 'add on' nature for movies plus RROD swung me to PS3.

Wii - great fun family console for what I think of as traditional gaming (i.e. Mario platformers, etc.) that are fun to play but also challenging. A little too underpowered for me (I live FPS and RPG titles like Oblivion, and after years of PC level graphics the Wii overall is just too weak in this department from my point of view). Still, so small and an easy choice for kids so I'll be getting one and settling for a PC, PS3 and Wii gaming experience.

Oh, and I love my PSP and my kids love their DS.

PSP - Bodacious
DS - Radical
Wii - Ultra Cool
PS3 - Hyper Awesome
Xbox 360 - Totally Killer
PC - Gnarly

PC - Great for online and computer stuff, not for games cuz I can't surf if I play games on it.

Gamecube - It was fun while it lasted, I use my Panasonic Q as a DVD player more than a game console

Wii - Now this is my definition of fun

PS3 - Living off of Demos at this moment and still waiting for Final Fantasy 13 (Gaming only) (btw, I didn't get DMC4 cuz bro in law has it and will borrow it so game count purchased since September: ONE...Enchanted Arms for 20 bucks)

360 - Too many sports and FPS games on it which is totally not my type. But Lost Odyssey has gotten me interested but I'll just borrow the game and console from bro-in-law

PSP - I use it more as a media player than a handheld for watching movies

DS - Very fun indeed and been playing Taiko Tatsujin DS...it makes me wish my fingers were pointies instead of needing to use the stylus. haha j/k

PS2 - still lovin' it...need to catch up on KH2 and FF12

I've played pretty much on the PS3 and X360 at my friends' places and they are both great (love NHL and Cod4 :D), and it's really nice with some HD graphics, but when I go back to playing on my Wii it just feels awesome to use the pointer in the menus etc. It's hard to describe.

When I use the more traditional controllers (i.e X360's and PS3's) I feel a bit restrained.

I really don't think the Wii is a revolution, but it really is more fun to play with the Wiimote. Same goes with the DS.

But I need some graphics too, so it won't be loong till I pick up one of the more powerfull machines. :P

360 - Definitely the most balanced of all. They nailed the transition between console and PC gaming. Great number of titles that range from casual to hardcore and it definitely has the best online experience. Sadly RRoD and the creator of it have somewhat tainted its name because people are tools. I'll definitely whenever it gets to sub $250 for the best SKU

Wii - Innovative, excellent first party support and always good for a quick fun. I like it best and I know Nintendo games will never let me down. Sadly 3rd Party companies like Squaresoft and EA are too stupid to come up with new ideas so for the most part we have to wait for Nintendo to innovate the controllers for these big 3rd party groups to come up with a decent game. Also the possibilities of WiiWare are endless and might also bring good ideas on how to use the Wiimote

PS3 - Overrated, pushy cuz I don't want Blu-Ray and I definitely will not be getting it till Blu-Ray cost the same as DVDs today, and that's sub $10 bucks per title. However its a dream come true for nerd techies and all the Sony tools out there (cough Europe cough)

PC - Has never been my cup of tea cuz I don't like to sit in a desk to play videogames. However I've had my share of games from PC and it has been a good experience

PS3:has the sequels to almost all games I enjoyed on the PS2,plus new great IPs,prone to dust collecting and fingerprints,much more reliable than its predecessors.

Wii:Tried and true great Nintendo franchises,controller sometimes is a breath of fresh air,could use a better online environment.

360:Best online,also has great new IPs,maybe the most defective console in history,more variety than its predecessor.

PC:Don´t really like the PC as a gaming device...

PS3- my favourite console. not living up to its full potential but that should change in 2008. Home and in game xmb are coming which should boost ps3's online play, also a wide variety of games are coming. blu ray disc is awesome and its the best multi media platform. we have yet to see the monster unleash its full power

xbox 360- a good console with superior online play but a quite narrow variety of games. mostly fps games, and 2008 looks pretty dry for the 360. past its peak and the 360 "domination" is over. perfect for the hardcore gamer. also it has a bad failure rate

wii- i hate the wii just because of the poo poo graphics and the games. ive never been a nintendo fan and will never be one. has a lot of fun games that the whole family can enjoy, and is perfect for the casual gamer, like my aunt its perfect f for example.

pc- i only play starcraft on pc so yea.

also you said ps3 is last in online play. i think wii falls into that category.