For warlocks, they are the class with the lowest armor score in the game, and can't top a Mage on the DPS scale if we tried. It takes more skill than you think to be a successful warlock in PvP or in PVE.
I'm sorry, but the primary form of armor you have until level 70 was Demon Armor, which increased your armor, and made you regen even while in combat, while the primarily used Mage Armor provided 0 armor, 15 resist to all schools of Magic, and 30% mana regen.
Additionally, from what I've seen, most Warlocks tend to have higher armor than Mages due to class-specific gear, and all Warlock-specific gear has much much higher +sta.
Lastly, your damage is going to vary depending on your spec. If you're still affliction, I wouldn't expect to be top on the damage charts, however if you have an Imp Scorch Mage combined with Destro-spec, you should be a good 4% or higher on the total damage done charts if you both are comparatively-geared.
As for Jason not rolling on Hakkar, my only response to the OT in this thread can be.
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