Don't expect to play games like Modern Warfare 2, Crysis, Mass Effect and be able to enjoy it. It's going to be a slideshow at best, and a still image at worst.
I have the Intel 4500MHD on my Sony laptop. The only 3D games I can play decently on it is Counter Strike Source and Dawn of War - Dark Crusade. It will not be able to play anything more graphic intense. Also, do not forget to update to the latest drivers. It gave me a 10-15 FPS boost.