Nah not by a long shot. Pre-nerf Vex takes the cake followed closely by the pocket sniper Hawkmoon. Also, Pocket Infinity.
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Thorn my boy
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While I could agree with Pocket Infinity because that thing is amazing; I have to say that the short time Vex spent being overpowered coupled with its relatively low usage (that drop rate though) and the fact that it's now more fun than useful--take it out of the running. Is it the most OP and broken gun in Destiny's history? Absolutely. TLW was really strong, then strong, and now somewhat strong. It had large usage and its time spent OP was longer than any broken gun in Destiny.