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.
This is a series of posts apparently taken from Pottermore strung together by insipid linkers which were usually no more than 1-2 paragraphs long. There were no actual stories that would provide insight into the world of Harry Potter. Disappointing.