I saw an article today (forgot the link sorry) comparing the new MacBook Pro with other mac models in games performance, and I recall seeing a MacBook used in 2 tests, where it scored at about 5FPS or lower, with 3GB of RAM installed (apparently 256MB allocated on the windows side).
The results will be floating around the web, check them out, it uses the same integrated graphics as the previous generation and so is absolutely not worth it for games, other things are fine though.