It's been brilliant so far I haven't come across any maps that I've instantly hated unlike mw3 (downturn, outpost). Like blackops1 any less than a four bar connection you're going to be dead before you know it, infinity ward have been more forgiving with poor connections. No death streaks thank f*#k or last stand BS, big step in the right direction not rewarding people who suck.
Perks unlocked by level is a bit annoying especially given Ghost is only unlocked at level 55, which means there are a heap of people sprinting around with smg's/shotguns/knifing following the UAV, this makes it hard to snipe. The game seems to be well balanced, I haven't noticed any go to guns yet, some of the maps are a little cramped and convoluted or maybe that's just me not use them yet.