I read this book because I am HP fan and JKR went on record saying that she liked this book as a child, so I was curious. I also read this book because of its mention in HP discussions elsewhere, so I was doubly curious.
Boy do I need to decrease my curiosity sometimes. I understand why little girl would like it and believe me some of the books that I read as a very young child are my constant companions through life. This book oh dear, for all my love of sweets, I found it sickeningly sweet and the heroine to be beyond obnoxious.
I would never forbid my child to read this book, in fact I am not a fan of forbidding to read any books, but I would not encourage it either.