Mr. King's early work was terrific. He always had a problem with endings, though. The "big picture" wasn't always there, but the small things were terrific. His short stories were great too (The Body, Shawshank Redemption, both made into movies, Apt Pupil and The Breathing Method were not and should never be).
His later stuff has been less good. Also he's gotten political. He was always a liberal, and didn't try too hard to hide it, but it wasn't in your face. Now it seems that all liberals do is get in your face.
The Stand was good. The Shining was very good (the book not the movie).
I thought both The Talisman and Black House were good. I enjoyed the Gunslinger series though the very last part of the very last book had an ending that reminded me of “the bear went over the mountain...and what do you think he saw? He saw another mountain...” So he opted for iteration over revelation. But it was still good, I mean, how in the world would he have been able to get to the top of the tower and reveal the secret of the universe in such a way that was awesome and answered all questions, and left every reader satisfied, but without becoming the basis for another science fiction/fantasy religion like Scientology?
Apt Pupil was made into a film, and a crackling good one at that.
And The Long Walk. Quite chilling.