The only reason it's always singled out as the most "op" weapon is because it's the easiest gun to tell you got killed by. The last word and red death are just as common but don't get nearly as much hate. I'm sure if they turned your screen green they would. Just my 2 cents.
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Thorn is not that OP In normal crucible some blue weapons are harder to dodge. If the player use it right. [spoiler]Not me, but they are around[/spoiler]