We also can't forget him not doing any research and retconning Mystique's history. He created Azazel I think. If I am mistaken, sorry. But that seems like a mess he'd created. Then the retconned Mystique's first meeting with Creed where she runs into him as a homeless woman, asks him for food, then he gives it to her & expects sex in return for buying her dinner. Then we have a panel of him on top of her while she thinks about being glad she could sleep through most of it.
It took fans writing him letters about that mess of a retcon that was nothing close to the story we were told years earlier. Then Austen admits he didn't know the previous story about them existed. Nice job Mr. "writer."