I'm a big CoD fan aswell and sold the game the first week. SP is worse then the last two and even shorter. The MP maps are the worst in the entire series, not a single good one. They also changed the way the charcter or gun moves, something is off. Everything in the game just feels different. The guns kill even faster then MW2 with stopping power, unless you have the lag advantage there is no way to win close battles.
All the guns sound the exact same, they dumped all the old gun sounds and just used the same sound for each one, just made some slightly louder then others. The spawning is broken, players spawning in the same room where i killed them except now they are looking at my back. If you kill a player him and all his buddies will spawn on top of you no matter where you are.
Regarding air support due to the close quarters of the map you can't even spawn and look up to shoot down anything without being shot in the back. Sam turets were also useless due to the close maps and constant spawn flipping.
Most of my games were played in Domination where spawns should be predictable, and based around the flags teams own. Excpet it was more TDM spawns and anything goes. And due to all the air support any class without the stinger and the ghost perks was useless pretty much.