It's the only hand cannon that can compete with Hawk moon which is the best hand cannon. If they nerfed Hawk moon first and then Thorn to keep the competition between the 2 or both at the same time that might work. But if you nerf Thorn and not Hawk moon there would be not a single hand cannon that could win against Hawk moon in PVP. 2nd if you nerf Thorn which is competitive with Fatebringer and Word of Croata you might as well make it non exotic because it would no longer be competitive with legendary hand cannons. Bungie really messed up this game adding PVP and not separating their nerfs for PVP and PVE. They can't make awesome weapons in PVE because otherwise a bunch of people will complain they are too strong in PVE.