I think the vex was a bit OP in PvP, considering the team that had one was often carried by one person. Maybe they went a bit overboard with the nerf, but something had to be done. If you want a balanced multiplayer, one weapon cannot completely dominate all others no matter how hard you prayed to RNGesus. Different weapons should be suited to different play styles, not just made so powerful that anyone can pick one up and be guaranteed total domination. The problem was that the vex had no drawbacks or disadvantages; unlike the shotgun (which has a short range) or the fusion rifle (which has a charge time and a fairly poor range). I'm sorry if you grinded out the raid, but that is no excuse to further decimate an already unbalanced PvP experience.