I dont have it myself yet. But based on the feedback ive seen from multiple content creators.
Mythoclast isnt the strongest option for anything atm (not that it'd stop me from using it).
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I have a idea for a buff that would give it a place in the game without being so good that its broken.
Give its base auto rifle style fire overload rounds. Then give the linear fusion shots anti barrier.
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Imo these two things would get it play time due to versatility without it being "too strong"
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The gun has an identity issue. It is as if Bungie tried to balance it around being a Fusion Rifle (so they didn't want to over tune it), but a 360 RPM AR and Linear Fusion, but it's stats are 360 AR which affects it's range and stability thus making the Linear Shot useless at long engagements which doesn't match the Role layout they came up with themselves. The gun doesn't need to be strong, just viable. It's currently not worth the exotic slot or occupying the energy slot.