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 book is a prime example of why I never read books with less than a 100 reviews. A good premise for a story, started off good, but by halfway through the book it became obvious that it was very poorly written. Page after page of 'filler'. Doubt if I'll read another of his books.