He has talent, we've seen it before, but after he got big he got really lazy and a little full of himself, and now he phones it in.
Half baked ideas, formulaeic and unrealistic dialogue that invades every book he touches, and he warps books around his personal preferences in way that make no sense and piss off fans from prior to his runs.
This happens to some writers who get big in general.
When they don't have to try anymore, they don't.
Stephen King phoned it in a lot for the last 20 years, james patterson doesn't even write his own books anymore, and dean koontz writes the same shit over and over and over and gets paid for it.