I don't use the thorn, but I don't think it's OP - because the number of shits I give about Crucible balance is zero. What I do care about is the pattern that has so far represented itself - which is that Crucible imbalances and preferences have caused Bungie to impact the PvE experience in a negative way. Autorifles are completely useless in PvE right now, and it's PvP's fault.