I see Bloodfest getting a trait in the next expansion that resets Gnashing Fang recast. So right now GNB is fine, though Camouflage needs to buffed to 25% damage reduction at the cost of removing parry rate, and Aurora instant along with regen effect. But other than that, GNB is pretty balanced, and the devs nailed most of GNBs kit right out of the gate.