its not that the usas is overpowered, the other shotguns are underpowered. i use the spas and the model 1887 and i dont care what anyone says those shotguns are way underpowered , its not suppose to take like 4 shots to the head at point blank range to kill someone, in real life shotguns are good out to around 40 -50 yards im mw3 there good for about 4feet , they all need to be fixed , they should have more power and more range , and the 1887 should have akimbo like mw2
As of your hitmarks, you either have the bad side of lag comp, aim bad, or bad connection.
The akimbo was one of the things that ruined MW2 1887.
To be honest, the less realistic and more balanced the game is, the better.
I like how the KSG is, if you aim it well enough it'll get you a 1 shot kill. Even from range.
If you aim like a cluts then you'll get multiple hitmarks. It's a balance of how strong it can be.