You cannot name anything other than Fists of Havok that is OP, though. All of their grenades are easy to avoid, their melee has garbage range and no effects and their Super can't kill more than one opponent if you don't bunch up. Also, if you say Shoulder Charge... Shotguns make Shoulder Charge useless. Plus, to get it, you sacrifice most of your damage resistance on Fists of Havok.