I've got a few, but I'm trying to get through them all. I did have Bioshock, but I finished that yesterday. Looking at my shelf, I can see...
Dark Messiah: Might & Magic (£2, bargain)
Dungeon Siege
Gun
Icewind Dale series
Neverend
Oblivion
Simon the Sorcerer IV
The Punisher
Thief trilogy (though I remember trying the first one years back)
Quake IV
Universe at War (also £2)
...there's also the Turok series (excluding the new one), but I'm starting to play through those. Wish I weren't, though. Evolution is leaving a foul taste in my mouth.