While Doctor Sleep is a somewhat drawn-out and, mostly, slow-moving film, it still has enough to it, to not lose one's attention. The story-line is solid and engaging enough, although those unfamiliar with the book and looking for outright horror and gore, will find little satisfaction. There are a couple of scenes which can be construed as "horrific", but IMO Doctor Sleep is not really a "horror flick" by definition. To me, it is more like an intense drama about good vs evil, with a couple of well-done 'end-of-life' scenes thrown in. :)
What I most enjoyed about it, is that in this day and age where practically every story ever has already been made into a movie, this one's plot was just a bit off the beaten path and came across as slightly new and original in its approach, while still pretty seamlessly tying it in to the well-known classic: The Shining.
If I had to add one con, it would be a somewhat minor one, in that, at times, the girl who plays Abra (Kyliegh Curran), who also possesses 'the shining', and who can communicate with Danny, delivers her lines in almost a stone-like manner, and at other times as if she is rapidly reading. It occurred one too many times, and I found that it took me out of the movie for just a bit.
While good, the scenes leading up to the ending are a bit predictable, and the 'showdown' (remember, good vs. evil) leaves a little to be desired. For the most part, however, I can live with it, seeing as Rebecca Ferguson saves it by just being in it, and King and the creators do their best to come full circle. In short, like the entire film itself, it is satisfying-enough to where one can feel as if watching it, was time well spent.