I fucking hate the USAS. I don't use it out of principle. Once somebody gets frag rounds in that hing, it's cheap death city. The thing that bugs me the most about it is that the frag rounds don't have any sort of damage penalty over distance. It's already annoying as hell to get killed by one close range, but when you're getting killed from WAY across the map by one, that's just stupid.
If you ask me, Battlefield 3 would be improved immensely by completely getting rid of all the shotguns from the game. Short of that, get rid of the frag rounds or severely nerf them so that if you try to use them, your gun backfires into your face, causing you to die three times in a row out of spite.
I fucking HATE the frag round, shotgun assholes in this game.
Oh, and Battlefield 3, you know that loading screen tooltip you have about frag rounds not doing much damage but being great for suppression......FUCK OFF! You are a lying piece of shit! If by "supression" you mean, "blows enemies to hell, thus supressing nearby teammates with body part shrapnel" then maybe I would believe you.