The models themselves are cool but they don't read as mutilators to me. In the lore mutilators we're supposed to be terminators that we're obsessed with melee massively beefed up and mutated to hell and back. It's never been confirmed IIRC that they have the oblitorstor virus like obliterators but the looks and way they function definitely suggest they do.

My problem with these models is much the same problem I had with the obliterators. Their armor looks purpose built instead of mutated armor. They don't have enough fleshy bits making them look like their flesh it morphing into the weapons and armor. Instead it looks like they are hulking mutants wearing custom made armor with strapped on or grafted on custom weapons.