Yea... it's not very fast. If all you ever had in a laptop were Intel Graphics, then they're a HUGE improvement, but that's not saying much.
The 9400m will play most source games without a problem. It struggles on L4D a little bit in my experience, but is still playable. A lot of other games are playable, like COD4, Oblivion, Far Cry, etc; but, they're only playable at very low settings.