I have a Core i5 MBP with the 330M nvidia chip,
I'm also a techy kinda guy and a professional software dev so this isn't some subjective garble, my performance has HIT THE FLOOR since I applied 10.6.4, whilst I appreciate that the directX api is mature and Windows really has gaming nailed, I dont expect an update to have a negative effect on performance!
I would say a 40% drop in Frames per sec.
As others have pointed out, HOW can this get through beta testing with release notes asking testers to concentrate on graphics drivers??
This needs to be addressed immediately.
It's so amateur.