Blizzard has let player power scale completely out of control in world pvp to the point where it is easier to kill a player than it is to kill an npc. I used to like going around and fighting people on my pvp realm in previous expansions. With the way it works now though, pvp combat between geared players only lasts a few seconds--either you one shot them or they one shot you. Whoever can get the first stun off will probably win.
The best strategy right now for doing the pvp world quests right now is to avoid pvp as much as possible or just get a sneak attack on someone. I can go in Bareback Brawl on my warlock and get some demons out fighting npcs, then one shot someone from full health with Thalkiel's Consumption. And then in turn, a tank can jump me and hit for millions of damage per attack through my unending resolve.
The damage is completely ludicrous right now and needs to be toned down.
I think what Blizzard should do to solve this is give everyone some baseline pvp resilience out in the world that increases with your gear score.