If you use Thorn and think you're good at PvP you've got another thing coming... And before butthurt Thorn fanboys try to gang up on me, yes, I have used it myself. I hated it because there is no skill in using a weapon that had a burn, none whatsoever. There's a reason they nerfed it.
**EDIT/ADDITION**
Let's just name weapons we absolutely hate in Destiny. Specific weapons or weapons types. It'll be more fun for everyone cuz what's more fun that insulting people, right? *Sarcasm*
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Some of us use it because it was one of the hardest weapons to get (atleast alone) and like it as a weapon of beauty and malice. I dont use Thorn in PvP as its not particularly honorable to kill a respected guardian in that manner, but it still remains my first and favourite exotic in the game. I used it when it was a piece of crap, i used it when they made it worse, and i would still use it were it not 100 dmg weaker than my other weapons.