Water is wet. Hunters are the worst in PvE. They do have a chance to shine in PvP as their supers are good there and so's their melee (throwing knives FOR DAYS YO). So, yeah, if we don't take playstyle and personal preferences into account I'd say Hunters are, by default, best at PvP to make up for their weakness in PvE. Doesn't mean a good player can't use a different class, doesn't mean a great player has to play a Hunter to reach full potential, they just have plenty of good moves for PvP.