What's your most played game this generation?

For me, a toss between Force Unleashed 1 and Alan Wake. 

I played Oblivion around 250 hours last winter, hated every minute

I don't know. I've had quite a few 100+ hour playthroughs.

Mass Effect. about 90 hours total.

Fallout 3.  310 hours.
I know.

" I played Oblivion around 250 hours last winter, hated every minute "

L4D2 I think played 300 hours for some reason, stopped because I was getting sick of it. 

Fallout 3 or Gears multiplayer or Super Street Fighter IV

Might be TF2 at 177 hours, can't think of any higher than that for this gen but I know I spent over 300 hours on Pokemon Gold, probably my most ever. 

Well, I did finish every single quest in Oblivion...

...then I started my second character.

MW2

i don't know. probably Super Street Fighter IV. i have like, 300 hours on that game. 

Puzzle Quest(DS), PixelJunk Monsters Deluxe(PSP) and Fallout 3. 
Viva Pinata:TiP would probably surprise me too if it tracked hours.

@Darktoad450

This is of course if we're ignoring WoW which...well...I don't even want to think about. 

League of Legends, without a doubt. Total I think I have 600 games played not including smurfs and co-ops.

No idea when this generation started. If you mean in the past 5-6 years, then probably City of Heroes.

Call of Duty 4, i have 24 or something days.

It's a tossup between Halo 3 and Halo: Reach. Lord knows how many hundreds of hours I've sunk into either but it has to be an ungodly amount second only to my WoW hours. 

WE talking about playtime or number of times replayed? If we're talking Playtime, then probably Monster Hunter Portable Freedom Unite/3rd. Replays? Probably Dead Space 1 or MGS4.

Borderlands, Mass Effect 1 and Devil May Cry 4.

Oblivion and Fallout 3. I'm not sure exactly what my total playing time is but it's at least 300 hours between the two. It's not a mind-blowing total but that's an unusually long time for me to devote to just two games. Maybe Bioshock  and Arkham Asylum as runners up, as I've played through those at least 6 times each.

If we are counting MMOs, then World of Warcraft. 

For multiplayer its been Halo 3, but Reach will surpass it soon. For singleplayer its ether Mass Effect 2 or Oblivion. I've sunk way to many hours in both of those games.

Probably Fallout 3, Halo 3, or MW2

That would probably be Age of Conan.

Either Burnout: Paradise or Red Dead Redemption for me.

Mario Galaxy 2, just a blast to play really,
and even when you have gotten pro on it, it still isn't afraid of killing you if you don't time your jump.

I'm guessing Rock Band 2.  Rock Band 3 will probably take that someday.

League of legends.

LBP. 200-300 hours

I probably have over 200 hours each in Fallout 3, Borderlands, Demons Souls and Mass Effect 2. Pretty solid considering most games I only play once.

BF2.

Crysis, I probally finished it like over 50 times. Of course not all at once, but over the years. Took alot of screenshots sort of movitaved me, so I just kept playing it because it was alot of fun. I also played mass effect non stop before mass effect 2 was out.

Fallout 3, without doubt.

That's a good one, I dunno. Probably either Oblivion or Forza 3.

Tales of vesperia. I started once and got 50 hours in.
3-4 years later I decided to start over because I didn't remember the story and I loved the story. So I put in 60-70 hours to finish it.
100-120 hours total.

Fallout 3 I think, more than 300 hours on that game.

GTA 4, Oblivion, Fallout 3, Assassin's Creed 2.

Fallout 3.

New Vegas and Minecraft are getting closer, though are still a really long ways off.

" I played Oblivion around 250 hours last winter, hated every minute "

Probably Mass Effect 1 but I'm not really sure....I don't really stick with one game for too long.

Word of Warcraft,  I've literally put a year of  my life in days played in the game over the past 5 years.

Super Mario Galaxy sucked in over 50 hours.

Does World of Warcraft count?

Probably Oblivion.

On the console, I've probably played Fallout 3, Oblivion, Call of Duty 4, Mass Effect, and Dragon Age: Origins the most.

On the computer, it would be Civilization IV, or Medieval II: Total War.