[–] SkepticalMartian ago (edited ago)
I'd go for turn based games. Pick up XCom: Enemy Within (highly recommended!), a Galactic Civilizations title, or FTL. Games like these will probably have the best chance of running well without much compromise (if any).
[–] stinkytaco ago
The original Ace of spades used the 1990's voxlap engine which did 100% software rendering. http://buildandshoot.com/
They call it build and shoot now. It will run on your grandma's toaster, and still is verry fun. lots of players too!
[–] mcseanerson ago
Not a whole lot. As others have pointed out though it can probably play some Blizzard games. I used to play the hell out of Diablo 3 on my macbook air when I was killing time. Also depends what resolution you play your games at. My native resolution on the macbook air was 1366x768 so it wasn't very taxing. I could also play Dirt 3 and wasn't too bad at Battlefield 3. Granted you will need to turn all the settings down.