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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I think the best change they could do is make it so charges stay indefinitely, and the stability from the catalyst affects the normal fire not the linear fusion fire. this isnt a tarrabah situation it wont be op if it keeps charges.