Thorn will be getting a buff soon... Hopefully..
"Not all our Exotic Weapons currently live up to this promise. In particular those weapons received from completing exotic bounties including Thorn and Bad Juju have disappointed many of us who have gone through the great effort to obtain them because, despite looking and sounding amazing, they feel underpowered. We're here to offer some advice: don't shard those guns. Their time will come."
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Given the lore behind Thorn, I personally think it should be the strongest hc in game. Impact and range on par with or better than Timur's Lash. Leave the rate of fire, magazine, reload, and stability how they are (low).