Max Payne 2 anyone?
Including the above:
Call of Duty (the original and the expansion UO)
Warcraft III
Diablo II ( the first was still better )
NeverWinter Nights
Fable
GTA 4 Vice City
Mount&Blade (great concept, somehow lacking but still good fun)
Half Life 2
Star Wars: Knights of the Old Republic
At the moment I am giving Arma II a try but it seems i need to upgrade my PC