This review has been hard to write, mainly because I'm most likely going to end up reviewing the movie more than the book. In fact, if you think you might like the book, just go watch the movie.
In short, I found this book confusing at first, and then annoying. Don't get me wrong, the story of "the princess bride" is a good one. But they did such a great job in the movie (most of the lines are taken straight from the book) that I would rather just sit down and see it played out than have to delve into the author's narration.
3 out of 5 stars. And that third star is only because the story itself is so good. Do yourself a favor: watch the movie. You'll get all of "the good parts."