Total War series [ROME is the best]
Star Wars Knights of The Old Repubic series [best games I've played]
Mass Effect series [Made by the same people as KOTOR and is pretty much the same, but still very unique and great games!]
Dragon Age Origins [Same makers/ gameplay as the two above, but is still completely different!]
Guild Wars [If you like MMORPG's then this is the best FREE one]
Hitman Collection [I personally love Hitman, and each one you play is as good and exciting as the last! Plus the controls are surprisingly easy on keyboard]
Bioshock series [Bioshock needs no introduction, it's mentally good ]
That's all I can think of right now
Wouldn't recommended CoD, price is ridiculous and the gameplay is lame compared to console version.
Agree entirely amazing game but I played it on XBox 360 do you now if its available on PS3 mate?