It's devastating but not really OP. Team shouldn't be huddled so close to allow 1-2 hammers wipe them. Supers are meant to wipe teams (except bubble). Taking a super down even with another super is a tactical situation. Gotta find what you as a player can do then work off that. Hammers put me down a lot but they are not indestructible. If anything they are just the hardest super to deal with for others.