I don't have any real problems with his style.
Inability to draw is not a style.
I'd put more value in the criticism if they put their money where their mouth was and proved that they could do better drawings on time for a comic deadline constantly.
First of all, that's not a basis for whether or not criticism is valid. Secondly, thousands of artists do it every month.
This guy shouldn't even be in the same industry with, say, Ariel Olivetti or Mauro Cascioli.