#1 - Oct. 30, 2008, 8:37 p.m.
For purposes of this discussion, pure = mage, warlock, hunter, rogue. These are the classes that cannot spec into healing or tanking roles.
I don't want to get too far down into what that margin should be, because then players return with a WWS parse saying "See, the mage beat me. You said we would be competitive."