I voted Other for I think Thorn should not be nerfed at all.
Not a single gun should anymore, and AR should probably be restored to their former glory.
Why?
Destiny's PvP is by its very nature unbalanced. Even if some matchmaking lists like "Void Arcanists suros only" were set up by Bungie, it would never be.
Weapons are a way to level the field, and the Thorn is just another gun which anybody can wield.
The way I see it, the players calling for a nerf on any weapon do so to help them have a "fair fight" against the said weapon.
Well, fair will not be achieved this way.
If a specific weapon gets nerfed, players will just move on to the next most efficient one, repeating the cycle.
I say no nerf, but instead learn how to counter playstyles that come with guns.
English
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Nerf TLW and Thorn to around .6 TTK and there will be no "best" weapon. All of them will have roughly the same TTK which makes for a balanced PVP.