A lot of people feel that Demonology warlocks will reign in the next wow patch. Affliction is what really should be feared.
This video is a simple duel between my poorly geared 60 warlock and my tier 2 mage. This was frapsed simply to show the amout of damage that an affliction lock can do in such a short period of time. It is not a real duel as I don't try and fight back with the mage..