Personally it's fine the way it is. Not meant to be a boss killer but it's intended purpose is aoe damage. Pretty decent add control.
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Not really. The AoE is pretty small for a super. And many others supers are extremely strong for add control. Like any "one shot" super, thundercrash must deal more damage to become a boss killer. For killing add, the melee ability is clearly better when combined with skullfort.