I was very taken with the book by Neil Gaiman, who is one of my favorite authors. It is a simple story about a young girl who feels neglected by her workaholic parents. They move to an old house that has been divided into flats, taking the large flat for their own. While exploring the house, Coraline (not Caroline!) finds a locked door in the parlor that appears at first to open onto a brick wall. Later, she finds it opens into another world where her "other" mother and father dote on her. They seem a little creepy, an effect enhanced by having large black buttons sewn in place of their eyes. She can stay, but only if she consents to have the buttons herself.... Read the book and you'll never look at buttons the same way again.
The movie actually extends the story beyond the book in several ways, and it does it without breaking it. In fact, the film's version of the story is better at least as handled on screen. The writers added an entire new character and improved the depth of the back story of the villainess. They even managed to fit a musical number in that was written (but not performed) by They Might be Giants.
Given that it was directed by Henry Selick (who directed Tim Burton's Nightmare Before Christmas, James and the Giant Peach, and Monkey Bone) the stop-motion animation is as striking as could be expected. More striking is the delicate use of 3D projection. The 3D was used to give extra depth to the scenery without abusing the audience. It was not used as a gimmick. There is a hint of the effort expended on the animation in a short segment after the credit roll that shows a sequence shot from a wider angle and without any of the clamps or wires removed. There was some CGI used, but mostly for cleanups and wire removal.
In short, see this movie.