I've read all published novels by SK, all pretty much as they have been published. The only book I have yet to finish is Dreamcatcher, though I have attempted 3 separate times. I will some day read it through. That said, I can't remember ever feeling as disappointed with any of his books as I was with Doctor Sleep (especially this one!) and Revival. In my opinion, they are populated with poorly written characters and their story lines are a mess; there is no fluidity to the narrative. I was afraid SK was hitting his "phoning it in & end of career period" but then there was Joyland which to me is one of his best and the 2 Brady books so far which are solid reads. But as always, to each his own.
I think I would have liked Dr Sleep better if it was a stand-alone novel rather than a sequel. The next time I read it, I'm going to pretend it's a stand-alone novel and the character's names are just coincidently like the names in The Shining.