Warlocks and AOE stun lol.

On a serious note for me, i really think its my BG that keeps me from hitting at least 1800-2k.
At an 1k rating, I was playing half the time guys in near full relentless or having relentless weapons. When you face off against disc priests in 30k hp's... not sure what the hell to do with that I didnt have the spell power to burst through most of them.