Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
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 analyzed reviews to verify trustworthiness.
My 7 year old bought these with a book token as she loves Julia Donaldson but wanted "more grown up" books she can read alone. Needless to say we have not been disappointed, she's thoroughly enjoyed them and bought most of the series.