the storyline is too short. I was surprised when I realised it was over... still really fun though. the latter missions are pretty intense and it becomes impossible not to get killed; and Japanese banzai attacks are awesome.. they come from all around you, so you have very little time to react at some points.
online maps look better (no shipment-style layout so far) and I like the addition of tanks. plus if you get a 7 kill streak, you can unleash a pack of wild dogs, heh.