Hehe loved a lot of game but tops for me are ...
Doom
Blood
Duke nukem - =D
Zelda - all of them but fave is majoras mask
GTA
Golden eye
Silent hill - loved it as a kid
resident evils
diablo2 lod - great game played it for quite a while till i got wow
WOW - loved it but going cold turkey, really isnt a health lifestyle raiding every weeknight.
left 4 dead - great to play and to play drinking games with mates with it
bioshock - Awesome game really love rapture
COD4 - my new addiction lol
probs missed a few but oh well