Blade Sweep balanced? (Level 3 Enc)

[the8bitdeity]

Does anyone think that the Barbarian Level 3 Encounter Power "Blade Sweep" is unbalanced, specifically when you have Rageblood Vigor? I think that the power seems balanced except in the Rageblood Vigor case. Seems like a minion sweeper with only one attack roll, since you'd be doing CON MOD dmg to all adjacent foes.

Thoughts?

[Donovan Morningfire]

Not that much worse than Great Cleave, a 1st level power which lets you do 1[W] damage to every adjacent enemy, with an added kicker to damage for each bad guy you're taking a whack at. Less damage seems a fair trade-off for not having to make an attack roll, with Blade Sweep being an "all or nothing" effect, where with Great Cleave you at least have a chance to hurt at least one target.