I fundamentally think Duggan, while not necessarily a terrible writer or even particularly less intelligent than Gillen and Ewing, is far more of a "by the numbers" comic writer, which was kind of jarring when I started reading his X-Men since all the other Krakoa books usually were more than just standard superhero stuff. Contrasted with Red and Immortal, X-Men just isn't as thoughtful but it has its moments and can be entertaining.