Here it is. The solution to PvP nerf conversations. If someone kills you with a gun you consider "OP", then switch to that gun and use it. If said person continues to kill you with "OP" gun, they are simply better than you and there is nothing you can do about it.
After that the noble thing to do is every time you see said person, immediately jump off the map if you can, if you can't jump off the map wave for respect, die and shut up.
EDIT: I wasn't expecting all these replies! Thanks everyone some great point have been made! I was kidding about the jumping off the map thing although it is always hilarious when I do it. Lots of messages about it in my inbox!
Or, just hear me out.
Bungie could balance the overpowered weapons to the point where everything was balanced.
I know they can if they continue to try.