I don't know how anyone, especially a paladin can complain about mana burn. I play priest/rogue at 2400+, and we hardly ever mana burn because its mostly useless. Even if a paladin stands in the open and get spam mana burned over and over, my priest will OOM from mana burning at the same time the pally OOMs, but then the pally can just divine plea, while my priest has no reliable way to regen. If anything, mana burn needs a mana cost reduction, not a nerf.