The hands and arms were introduced by exo-force, those don’t count.
The legs are atrocious, unposeable hunks, that are three studs wide for no reason.
And it is basically incompatible with any other type of minifig. You can’t use a piraka minifig head on a regular minifig, and while a regular head can attach to a bionifig torso, it’s super loose and falls off if you look at it wrong. And the legs aren’t compatible with anything, not that you would want to use them anyway
Sorry, but i gotta agree with Athena on this one. Sure, they’re better than the 05 figs and the 07 figs, but their design is still awful.
Possibly unpopular opinion: The HF minifigs are what the Bionicle minifigs should have been: recognizably different, while still fitting in with the rest of the minifigs that exist. The only thing they lacked was wrist poseability, which is easily resolved by giving then exo-force arms.