IMHO the 3x3 playlists like Salvage and Skirmish do indeed see Thorn users in them, but I don't think they break games at all. I've been playing a lot of Crucible now that IB is over, and I've lost when either I'm outclassed by skill or teamwork, not by a weapon. If Thorn gets nerfed again before it returns in Y2, though, I really don't care. I just want to use it in PvE again!