What's wrong with that? Everyone should have a choice of what gun they want to use in crucible. Xur is just helping those that don't have as good as luck as others. I'm not even good at pvp and I've survived the red death phase. The saint 14 phase. The suros phase. The fel winters phase. Oh and the praxic fire phase. I'm not saying your bad at pvp by any means. But part of pvp is learning to anticipate your targets moves. There are ways around it just like every weapon in this game :)