it might have been said before(I gave up reading all replays in mid first page), but in that case I just second that guy
Vampire the masquarade - bloodlines (I still play this old thing today every now and then)
deus ex - invisible war (like vepire, it's a kind od an FPS\TPS quest...very nice)
Advent Rising - an amazing game if u like being the super-hero guy who needs to save every1 and be really cool and is the "have no fear, I am here" type
FEAR (I saw it was mentioned before, but it's worth enought to be rementioned)
the suffering - ties that bind. it's very nice, but very hard to get used to (extreamly hard if u've never seen the first "the suffering")
area 51. E.T's coming to lunch, and u're it. fun, but not all too long (very nice story...feels like a movie in a game in some way)...quite old, but good non the less
psy ops. again, if u like beein a "I can do it all" super-hero...u want to get this (not so new like area 51, but not bad at all!)
and last but not least, metrix path of new (PON). I just love going kung-fu on a bunch of *****s...and this give's u just that, in the extream
I hope u'll enjoy which ever ones u play
Neowizard