That's not overpowered though, the reason warlocks have a damage output higher then any other class is because its all we bring to the table.  We have no buffs and very minimal group friendly skills.

The entire basis of the "warlocks are overpowered" mentality is that for whatever reason people believe that some other class should be the top of the damage, say fire mages, but they have the ability to conjure water for themselves and the group, to polymorph targets for CC, and can do neet things like root and stun targets.  All of those are very group friendly, so for them to have all that AND be the undisputed kings of damage, that would be overpowered.

It's funny how you don't hear a peep from the mages and druids when you cast CoE and put their DPS through the roof.

Same goes for shadow priests. All of a sudden we're everyone's best friend.

(Well, if they notice)