Do you know why? It's not because of golden gun or because of arc blade, no not at all. It's simply because the hunter class is the best set up for close quarters combat thanks to their agility. Now combine that with quick reflexes, high sensitivity, good aim & good strafing and you have a problem.
Any hunter that utilizes these will dominate pvp, it's that simple. I for one barely use my super, not even half of my kills are with my super.
Side note: arc blade isn't op plenty of things can easily stop it such as heavy ammo, well placed headshots, your super, suppressor grenades & even dodging. As for golden gun its nothing wrong with it you can easily kill someone with normal means real quick, don't know how many times ive killed one during activation & if all fails just run.
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The simplest way to put it is the Hunter has the best overall mobility in running and jumping. They get where they need to go quickly and outmaneuver the other classes. That alone would make them the best PVP class, but there's even more than that. On top of that, add subclass abilities that are extremely relevant to PVP, such as making weapons ready immediately, making you slide further, increasing your reload speed, increasing your weapon stability, etc., and you have a Guardian killing machine. More good PVP players are going to want to play the class that best augments their skills. If they are very competitive, why would they use another class if it is subpar for the task at hand?