I play a mage and from my point of view a warlock does "seem" OP. Its just really hard for us to beat a lock, in my eyes that is what makes it fun, it is a challenge. But I see warlocks get eaten up by the other classes just as much as me in PVP. I do remember in an AV once a gnome lock kept killing me over and over, i kept looking at the score and she was down near the middle while I was up top. So I do think the lock class is balanced...just not against mages lol.