all you have to do is take off supers and heavy ammo from the crucible. they really have no business there. that alone will boost the balance of pvp a lot in my opinion. the game will be more skill based in the way that you wont be able to kill 4+ people at the click of a button when you shouldve been dead.
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But it is balanced because everyone gets supers and everyone has a chance to get heavy ammo. Take that away and you're just left with cod but with more health.