10K with magic missle? Dat be sum h4x rite thar. I get 21Kish HP in PvP. 10K would be ridiculous. They do more of 1-2K in PvP.
The only classes that I think are absolutely overpowered in PvP are Thieves, Gunners, and Exos. All the other classes are relatively balanced enough, give or take a class or two that has more trouble PvPing (Like a summoner).