These novels hardly need separate reviews, since each is based on the same formula, though The Prisoner of Azkaban (#3) is the best of the three (it has the most plot twists, and it's got a few dark—though shortlived—moments). They are light, simple, enjoyable confections. It's been 20 years or so since I've read others in this genre, but these would probably sit happily alongside Lewis's Narnia Chronicles, Tolkein's Lord of the Rings, or Baum's Wizard of Oz books. However, unless the rest of the series is even better than these first, Rowling won't stand the test of time.