"Enjoyable"
While this is not King's best (but he's had so many bests), it's good King. Really good.
I disagree with the other reviewers. First, this novel gives some insight to The Dark Tower series, especially into Flagg, the man in black in the DT series and the villian from The Stand. Also, the story is set in Delain and picks up many references from the DT. Second, Bronson Pinchot is an excellent narrator. He was always clear, never annoying, and made the story come alive, especially with Flagg. Excellently creepy!
The story has an enjoyable, youthful feel to it, and Pinchot carries that well. I would certainly buy another book narrated by him.
The book is fantasy. I'm not sure if some reviewers think King does only horror and are disappointed when their expectations are not met. But I think King does all of his genres quite well. This one is appropriate for tweens, so it's a good starter King.
If you love the Dark Tower series or The Stand and still want a bit more, The Eyes of the Dragon is worth a listen.