A barbarian could make good use out of it.
Whirlwind. Check out the barb forum for guides.
Minions will benefit a lot from the fanaticism aura, so it's worth using it on a summon necro, for example. He will lose a minion or two when switching from a summoning weapon like Arm of King Leoric to Beast, but their strength will stay the same and their increased speed and damage will outweigh that by far.
He has already made it, and the zerker axes restrictions aren't that for off if he has enigma.
I would say use it on a holy freeze pally, that could be fun.