At the moment:
A Valley Without Wind
Just released, but I've been playing it from early beta. A metroidvania-ish indie game from the same people as AI War, but with far more to it than that. Great fun and has plenty of wear in it.
Supreme Commander 2
RTS that some don't like because it's not quite as serious as its prequel. With the DLC it's great, and it boasts probably the best RTS AI ever - if the player can use a tactic, so can the AI. Also, any game that has GIANT BRAINS WITH LASERS and battleships that can grow legs, walk on land, and then jumpjet into your base has to be worth a try.
Bulletstorm
FPS that some criticise because the main character isn't a do-gooder with a halo so big you can see it from space. Me? I say that's the whole damn point. Also has some exceptionally inventive cursing and one of the best and most consistent stories in any FPS.