I think its one of the best weapons in the game!
Because:
You can do the Eris Bounty (3 hive with special weapon) & the '2 enemys with fusionrifle' thing instantly with the Mythoclast.
First mission on moon, open the door, shoot with Mytho, Profit!
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I wanted it when I didn't have it... then when I got it I was underwhelmed... it's good... but not good enough to replace the exotic slot for ib in pve and I still prefer pi in pvp.