He deserves the blame for not writing a good book nobody is denying that but what needs to be noted was not a easy assignment. I think with proper context people will be a just a tad more forgiven I think. It seems he is writing" the last X-men or last days of the X-men story" with understanding that everything he writes won't stick. He got to write a X-men book where multiple characters actually got to die,something that does not happen often because companies are protective of their properties. So far this seems like one of these stories where everyone dies and time travel or other plot device reset everything. With that context his whole run probably doesn't matter and all the characters dying don't mean anything just like Twilight final battle
He is not going to stick the landing for fans here let's not even pretend that is going to happen but he is writing story that doesn't matter because Hickman is clean slating the X-men franchise. So fans feeling ultimately don't matter good or bad it wasn't carrying over. He wrote Dark Souls,Multiple man and Astonishing well so we know he can write but tying those plots to this story was probably the big mistake but I don't blame for closing out his plots before the franchise complete changes and wipes his stories. I mean for example someone put in a long term plotline about a mutant not really being a mutant and we honestly are never going to see it. Age of X-man books and Uncanny X-men were lame duck books especially when Hickman announcement hit. They were lame duck books in the fact Hickman is changing the style of the X-men and certain storytelling styles might not be viable anymore. He wrote a bad story but anybody in this situation would have had a tough time.