SmoothCriminal on 28 March 2010
Civilization series
Half-Life series (especially the first one)
Age of Empires/Mythology series
Starcraft
Diablo II
Any Bioware game
Dungeons and Dragons (I know it's a board game, but I'm counting it)
The Elder Scrolls series
The Fallout series (especially the second)
Resident Evil 4
System Shock series
Fire Emblem
any MMO
Braid
The Ultimate DOOM
Total War series
Secret of Monkey Island (or any LucasArts adventure game)
Any Zelda game
Counter-Strike series
Call of Duty 1 (I can beat it in less than 2 hours after 6 years of non-stop playing, but I seem to always play through it at least twice)
Battlefield (especially the second one)
F.E.A.R. 2: Project Origin
Crysis series
Farcry series
Mount and Blade
S.T.A.L.K.E.R. series
