I pvp on as destruction. Typical raid spec(check armory in sig), yea its fire but it works. Start with immolate, then searing pain until you are noticed then hit them with either shadowbolt or icinerate. If they survive long enough for the second backlash to get them(melee) then they are a better player than i have met. Against casters same thing just switch up your casting of incinerate and shadow bolt so you don't get locked out of one for too long.
also resilliance is minimal when they can't find you, i am logged in my pvp gear and usually come out on top.(plz don't bring up how i don't do arena, i find it too easy on a lock, so i use a friends mage to get him his points since he can't play that often)