Actually, it isn't. He's not saying the sculptor's a hack or talentless or anything derogatory about the person who sculpted it. All he's saying is that it's not right and has a hard time grasping the innaccurracy when other companies have created pieces of the same design and got it right.
It's a bit over the top to point out that Hasbro got it done in a 3 3/4" scale, but it also emphasizes the point.
And knowing Irish's postings regarding Sideshow for a long time around here, I know how he feels. Irish loves Sideshow like a parent loves a child. Proud of their highlight moments, but giving tough love when he knows they're not living up to their potential. He's emphatic about the helmet fix because it's not as though getting the helmet right is impossible, it's been done many times, so his point is, don't settle for what you've got, I know you're capable of making something as nice as anyone else out there has, so do it, make the best Clone that everyone knows you're capable of.