I was actually spooked reading The Shining. Nervous as all hell when he had to walk past the fire hose FFS. Stephen King is a master at creating atmosphere. No chance in hell of creating the depth of feeling in a movie.
The Hobbit would have to sit pretty high on my worst adaptation list.
Robin Hood with Russell Crowe hangs pretty low on the tree for me too. It would have been better to call him Barry Smith and leave the movie to stand on its own - it just wasn't a Robin Hood story.
Book to animation - worst I can think of was The Black Cauldron. If you ever read the full Chronicles of Prydain you will see how much the story suffers for the sake of happy Disney kids.