For me it's definitely people that never even use their primary weapon once, but just run around and shotgun melee the entire game.
I don't know, what do you guys think? If you have something else that you rage at in crucible, make sure to post it down below and I'll be sure to check it out!
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Laggers. I shouldn't have put two melee strikes and three shotgun blasts into a Hunter to put him down. Nor should a player take three more steps before dying after I've put my three Thorn round into him in rapid succession.