I've just tried crysis 2 using intel driver and I couldn't run it smoothly unless i set it to 800X600
Did you make sure to put the pro in high performance mode while gaming? Mines plays pretty smoothly at 720p resolution. You keep vsync off? I forgot the other settings as I know the lowest is high. But I think some you can cut off. Or try 720p resolution but no HD textures or something similar. Although I leave mines on.