I actually think it can be justified. With Black Hammer, all devil walker encounters became trivial. Remember when they were at least somewhat of a challenge? Now they are just target practice. The Cabal tank also became a pushover. This weapon is so powerful, that if not nerfed bosses hit boxes would need to be harder to hit to compensate for this single non exotic weapon. Besides, I will still be using this weapon. It should be great for bursting bosses after picking up special ammo. I just recently got it too, but I will enjoy it while it lasts and accept the nerf.