screw it, im bored so here it goes, most of these dont break the game but are f**king annoying or things i found weird:
leveling system - i dont understand why if i play for a game or 2 and i have multiple messages in my inbox about boost lobbies, this doesnt break the game but its annoying to get the same message constantly, why do people actually care about their ranks
weapons - there were a load of guns in 4, where did most of them go, why not just add some instead of switching for new ones. also, why the change in unlock levels such as the .50, m16, m21 and ak47.
attachments/perks - heartbeat sensors are bull, enough said... cold blooded is stupid... duel weapons is a completely stupid idea, someone should get a video camera a try this, take two shotguns, run full speed and fire them both off... certain perks break gameplay such as commando, lightweight and marathon when used a certain way
maps - theyre mazes if you havent played them much and to put it blunt, most of them suck and the good ones you have to download for high prices yay...
killstreaks - forces people to camp because they want that nuke
lag - i shouldnt have to explain this...
spawning - i have no idea how often i would see a kill cam of the person getting killed by me, spawning behind me and killing me... fills me with murder frenzy
halo jumping/drop shots/quick scopes - these are just very weird things people do, i dont understand why people do these
thats all i can think of at the moment