A lot of people seem to be having a difficult time in the PvP. Obviously better gear and weapons help, but a good player will still be able to win on the strength of skill most of the time, especially with the damage bonuses disabled.
I just got MVP in the last match I played but it was on Bastion and everyone kept running into my Fusion Rifle because it's the only gun I have worth using. Skill does play into it but when your guns are completely outmatched (i.e. an enemy auto rifle that is both more accurate and has a larger clip) it makes it difficult to overcome the gap.