Broken, maybe not. If that means it is OU then fine, but to be honest I don't like what it does to the metagame. The sweeping / revenge killing sets are fine but when you have something which will just predictably come out first and almost always get SR + Spikes, or both Screens, it makes playing with defensive teams very very difficult. In particular the Deoxys-S / Scizor / Rotom-W trio which has become stupidly popular recently absolutely breaks stall teams, because Deoxys-S simply allows for too much of an abuseable advantage early in the game. Like Delta said, you literally can have no way of knowing what set it's running until you either risk it KOing your "counter" or it gets to set up at leisure.
Because of this, my vote would probably be for Uber, just because it really badly hurts the viability of defensive playstyles. This discussion is interesting though, I'd like to see where it goes to.