Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
My son is hooked on this series, he was a little disappointed that this book was"thinner" than the first book. It still had him hooked and he finished it in two days. So, with that said yes, it would have been better if there was more added to this book to have made it last longer for my 8 year old to read. My son even said that the first story had more going on than this book.