Yes, I enabled all the accelerations I could find, and did also install VMWare Tools. No help.

We did download Steam, and of the 10 games that we have purchased on his Steam account, 2 were available on OSX. Repurchasing was not required; games on his account were there and available no matter which OS we logged in from. Just the Windows-only games (like Call of Duty) were thoroughly unacceptable for actual playing. When you're playing an FPS, frame-rate matters...And when you can't aim your weapon because you're only getting 8 FPS or whatever, that makes the game unplayable. Which makes it all a moot point.