Not a huge fan of this movie. I've read the book, and I prefer it in many ways.
The whole premise of the book was about Jack Nicholson's characters descent into madness. In the book, this is far more of a psychological journey - with the character struggling with both alcohol addiction, and feeling distant from him wife and child. For most of the book, your never quite sure whether the hotel is really haunted, or whether the main character is just going mad. The movie was a lot more surreal and obviously supernatural from the get-go.
I also think Jack Nicholson was miscast for the role, because we can all see him to be clearly crazy from his very first scene. I don't think the audience got a chance to get inside his head, or to experience his journey alongside him. He was just crazy Jack Nicolson all the way through!
My favourite thing about the movie was Shelley DuVall's performance. She played the hysterically terrified wife really well, which gave the film a sense of reality it wouldn't have had otherwise. But, alas, she'll forever overshadowed by her more showy co-star...