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.
I like Richard Scarry's work very much but I'm not too keen on this one. Just a matter of personal taste so don't let anyone get put off by this opinion. It's just not much like his other publications.