Even though everyone says he's easy, keeping the melee DPS up with paladins was hard. My kingdom for a resto shaman or holy priest on that fight.
I wore my Arcane Resist set, and ran into melee, keeping Judgement of Light up and tossing Flash of Lights. It was very stressful, especially because all the melee are taking damage at the same time. Judgement of Light + Improved Leader of the Pack helped a great deal.