He asked for some other tips as well so I wrote one aka to consider some other caster if he wanted to play damage dealer in group pvp(
Well yeah, he asked about "group PvP", I understood that as a Premade environment, if he meant pug BGs as well then sure, you can play whatever, there's no any organization and people just do random stuff in radnom setups so roles don't really matter. Ofc priest dispels better then a warlock and it has it's own strengths, but in group PvP you should have a priest healer with you on offense anyway, it's enough for lock to dispel CC'd priest and he dispel other stuff. Topmong put it right that he doesn't bring anything special to the table in combination with the other classes in premades, whereas warlock brings shitton of unique utility and more damage, that was my whole point.
Bottom line is, Hyugarr if you wanna play priest in premades, any kind of priest healers on Horde is what's lacking the most on the server. Noone really lacks SPs for such games, but Alliance pugs do lack any casters since they are really melee heavy, so that's probably where SP would be the most useful right now.