Topic comes up a lot but here goes my list again and it hasn't really changed lol

Super Smash Bros Brawl - 500 hours easy

Monster Hunter Tri - 140 hours

Twilight Princess - 80 hours

Fallout 3 - 80 hours

Starcraft II - 80 hours will likely be a smash bros type game later on when I can play with friends on a more regular basis

Call of Duty World at War (Wii) - 100 hours and top 8 in the world

I know the 3DS is out but whatever I'm going to list my DS titles as well

Mario Kart DS - 200 hours (over two game carts)

Metroid Prime Hunters - 100 hours (getting to the top of the charts)

Pokemon (each with the exception of White/Black for now) 100 hours

Yeah.... a lot to say the least.

single player:

1. Shogun 2 Total War (consumes so much preious time)

2. Fallout New Vegas 

3. Uncharted 2

4. Assassins Creed 2

5. Orange Box

Multiplayer:

1. Call of duty World at War(500 hours, one of the first mp games besides small matches of cod4) 

2. BattleFeild Bad Company 2 (Love it, so fun)

3. Call of duty MW2 (It was hoildays but it was gone shortly after the Hype worn off it)

4. Call of Duty 4 (great game)

5. MAG (sabotage was fun for first few months)

Wii

Super Smash Bros. Brawl

Super Mario World (VC)

Twilight Princess

F1 2009

360

Red Dead Redemption

COD Black Ops (multi)

Mass Effect 1 & 2

F1 2010

Borderlands

DS

Animal Crossing DS

Phantom Hourglass

Clubhouse Games

PC

Minecraft

League of Legends - Not sure on this one. Been playing for several years.

FF13 - Over 50 hours

Persona 3 (came out during this gen) - 90 hours and counting

Modern Warfare - I believe I got over 50 just on multiplayer

Demon's Souls (over both the import and the US) - Easily an 100 hours

Oblivion - ~80 hour

NCAA 11 - Well, I'm on my 5th dynasty season

This generation has mostly liked games of fighting stuffs,racing games and even adult games. Being a part of this generation I have mostly played the above three types. In recent I became huge fan of bike games becuase of my age.

Games like-

Halo games

Battle field

monster riding

Witcher 2

Some of you are scary as hell.

600 hours of Ninja Gaiden Sigma 2?

Mine is probably FFXIII with something like 100 hours and then Uncharted 2.

But other than that I haven't played the same game a lot.

PS3:

Single Player:

MGS4 (Around 30 hours)

Assassins Creed 2 (Platinum 30 hours?)

Assassins Creed: Brotherhood (20-25 hours)

Uncharted Drake's Fortune (Platinum)

Uncharted 2 (25 hours counting MP)

Rock Band (35 hours)

Multiplayer:

CoD4 (10th Prestige Rank 55!!)

Warhawk (30 hours)

MW2 (50 hours)

Black Ops (50 hours)

SOCOM Confrontation (30 hours)

PC:

Counter Strike Source (100 hours total)

Day of Defeat Source (30 hours)

1. Modern Warfare 2 

2. Black Ops 

3. Halo 3

4. Star Ocean the Last Hope 

5. Last Remnant

6. Lost Oddyssey 

7.  Final Fantasy 13

8. Call of Duty 4 

9. Halo Wars 

10. Heavy Rain

My list is Multiplayer and Singleplayer combined.

Shooter and RPG's got to love them lol.

Dragon Age: Origins. 4 playthroughs with all sidequests I could find done needed lots of time.