The Chamber of Secrets is in my opinion the weakest of the Harry Potter books. Still, it is a great read compared to 90% of other books in general, and 99% of other children's fantasy novels. The art in these books are simply amazing. They add to the story subtly, rather than take the story over as the movies did. To me, this is vital, as part of the joy of the Harry Potter world is the evocation of your imagination. I am happy to give my kids a little push with art, as they clearly still create their own images of quidditch, Hagrid, and the often explosive and unexpected effects of Ron's broken wand.