They essentially took Thorn's perk away. It's just a hand cannon now. Exotic doesn't really come into it.
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I don't understand the need to change it at all, it's a year 1 weapon that 3 shots. It basically isn't exotic right now, the dot allows you to not focus on precision, but three shots in my opinion isn't that OP, and there are many counters to it right now. The only thing that made sense at all was to tone down the blinding effect a little bit, but even that wasn't hard to play with