Some mmos that I play are EQ, EQ2, EVE, Defiance, PS2, Fallen Earth
Some offlines that I play are Fallout 3 New Vegas, Skyrim, Metro, Need for Speed, GTA, Dark Souls, Crysis 1 2 3, Mass effect 123, Dragons age, Assassin's Creed.
In general games with gripping storylines and extreme graphics
I've been an ATI fanboi for years, though I recently got hold of a 760 (RMA'd heat pipe chatter) that blew me away. I still noticed some minor things that my 7750 did better than the 760 tho. Mainly the smoothing of jaggies.