The man is an utterly amazing artist. His more traditional works are proof of that. He's just really... not good with redesigns. He's made a few good ones (moreso recently, after some people more publicly voiced their distaste for many of his redesigns), but the vast majority range from just generally blah to utterly unrecognizeable as the characters they're supposed to represent. A lot of them also suffer from trying far too hard to be "OMGWTF X-TREME TO THE MAX!!!!"
And he has the most obnoxious, obsessive fans of any artist I've ever seen. Most of them know nothing of the franchise and treat his works as though they're the greatest things ever inked. It's not uncommon to see comments along the lines of "I've never heard of this monster before, but this is one of the coolest things I've ever seen!" and "OMG! The original version of this monster looked soooooo crappy, but this is awesome!" I honestly have more of a problem with them than I do MF's art.
Also, this should be in Fan Art. I miss my mod powahs.