The only two games I play at the moment are BF:BC2 and AoC.
Both are incredible games, and both do well to make you appreciate the hardware in a balls-to-the-wall gaming PC.... DX11 in BF:BC2 as well, although I've heard many say that it really doesn't make much of a difference. I wouldn't know (I run 4870s). Unfortunately, though, both games suffer from constant bugginess and "issues". AoC is MUCH better than it's ever been (from a technically stable standpoint), and its engine and graphics make WoW look like child's play.