My former warlock class leader is in a 2k+ rating 2v2 team right now with my former guild leader, a rogue. He is Nightfall/Shadowfury (geared for damage), the rogue is 41/0/20 Mutilate, and the team composition and spec shocked me. Both are awesome PvPers, and I think the setup catches a lot of people offguard. I think they'll run into trouble against the "outlast" archetype, but it shows warlocks can conceivably reach 2k+ rating without speccing and gearing for survivability.
His name is Wisdikin if you want to look him up on Armory.
