I've posted once, and re-itterating the FEAR series, although i've only played the first one, and understand that the others are just as good.
Stalker series is good, but its like marmite, if you can get past some of the control system and the way the game 'is', its a very good story, basically an FPS/RPG in the sense of the narrative content.
Crysis, is a good game tbh, it was over hyped but because i dont pay attention to media hype i enjoyed it for what it is.
Left for Dead is amazing, I cant count how many hours I have wasted on that game with friends / forum buddies.
Assasins Creed was fun, although yes on XBox.
HL2 (Dont know if you've played it)
erm, there are loads, i just cant think atm
