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.
I'm a huge fan of Aaron Blabey and so is my 2 year old. While his stories usually contain a small moral of sorts, this one is purely for fun and very silly. My daughter finds it funny and so do I. The illustrations are fabulous and the size seems just right. Do get the hardback version if you are considering this.