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.
Bought at daughter's request - being a young teenager any book request is rare and so is instantly fulfilled in the hope it whets her appetite for reading! She enjoyed Wonder and so naturally thought this was on par...apparently it's not.