no good reason? barbarian constantly spinning around and doing full dmg with possibility to crit at silly hp cost on heroic lvls is ridiculous. as overpowered as casters in low lvl content.
i wouldnt mind shorter cooldown if it was 10% hp each use instead of flat 10hp then u would think twice before using it 5 times in a 5-10 seconds time frame when surrounded by 10 mobs