This is a ramble, but i thought i'd add something to the debate, and my friend Peacefield and i always clash over this By my avatar you might have guessed i find The Shining a fantastic piece of work (film and novel).
Okay, i agree with how disappointing it can be, that it is not very true to the novel and the novel's genius like the adaptation of say, Misery, was. Though there is plenty of inspiration from the story within the film, enough for me personally to be satisfied. But, i disagree with a lot too.
King commented that the film was 'cold' and that it was like a beautiful car, but without a reliable engine to make it purr along (or something along those lines). Which is true with respect that it was his own creation, but he should be flattered that someone as intelligent as Kubrick decided to create something so fantastic from his work and realise that it is a totally different interpretation. They are both brilliant.
Kubrick was a very different director from the 'norm' and very clever with his work. I think he could have made a mere 'adaptation' in his sleep if he wanted to. He loved King's premise, so built on top of that foundation for his own purposes and means. The Shining (film) is full of hidden messages, social commentaries on America, the theme of communication and isolation, the digital media age versus the written media age, and the concepts of such things as labyrinths (hence the change from hedge animals to a hotel maze), duplicity, and the unconscious mind with references to Freudian theories. It's such an amazingly complex and clever film. It's like a whole metaphor of a maze in itself; there are so many levels to it.
Once you start to realise things and see the meaning behind the film, it becomes a LOT more frightening than you consider at first glance - in fact, most people are annoyed at the lack of action - but this is the point. The story is not the focus of the film, it's the things which don't happen and what isn't shown or explained. It's a film which makes you really think, and just gets inside your mind and disturbs you the more you dwell on it. Like, you actually get lost yourself in that maze of the film. There are deliberate 'mistakes' embedded in it, to add to that disorientating feel. For example, Jack's typewriter actually changes colour in one scene and stays that way for the rest of the movie. Also, the chairs at the bar (where Jack is 'talking' to Lloyd) change position after Jack walks into the Gold Room, as if inviting him a way in). Of course, it could be fairly 'obvious' that these are actual continuity errors, but with someone as meticulous as Stanley Kubrick and with the content of the film he desired to create, it's unlikely. There are a lot more. With the Overlook, nothing is ever static or 'certain'.
We barely ever get a clue as to what is causing this, is he actually going crazy? Why? Is he being possessed? What by? Does he actually see these ghostly inhabitants of the hotel? Or is Kubrick suggesting that Jack is insane from the very outset, by the way he includes mirrors in such scenes?
The scariest part of this film, to me, is the moment where Jack is just staring out of the window, his demented face illuminated by the impending snowstorm, and his eyes roll up slightly and the hint of a smurk begins to etch across his face, you just wonder what the hell is he hearing or seeing in his mind.
That is one of the most frightening parts of a movie i have ever seen.