To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Got this as a gift for a spoiled little girl and her parents were so unimpressed they didn't bother to read it to her. My kids loved this book when they were little, so I don't know whether I'm just old or if that family is screwed up.