Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
As an example: Civilization V runs way better on Windows on my machine (Ultimate 13'' Air). On OS X I need to turn off a lot of details to play it (it works fine besides that).

On the other side, Starcraft II runs smoothly on 1440x900 and Medium/High details. Awesome job done by Blizzard. :)
 
I find almost all Steam games play better on Windows in Boot Camp than native Mac OSX versions on my MBA13. Same goes for a few MMO games. In fact, one MMO in particular CRASHES consistently under OSX native client, while the Windows version is rock solid.

Generally speaking, I find gaming under OSX to be pretty craptacular.
 
On the other side, Starcraft II runs smoothly on 1440x900 and Medium/High details. Awesome job done by Blizzard. :)

Yes Starcraft 2 seems to be an exception. I ran it both on Windows 7 and OSX 10.6.6 on my iMac i5, and the frame rates were pretty equal (+/- 5FPS) with the same details/resolution/graphic options.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.