They need to get rid of these rediculous killstreaks, seriously. Thankfully, I think it's been confirmed that there will be no way of ending the game (Tactical Nuke or something similar), but they really need to stay the same as WaW. Just have 3 killstreaks get rid of all these stupid helicopters and what not, just have: UAV for 3 kills, Airstrike for 5 and Dogs or something similar (e.g. helicopters) for 7.
The host migration does not work at all also, i'd just get rid of everything you've put in the list bar Marathon and Lightweight, which I don't think are that big a problem.