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 analyzes reviews to verify trustworthiness.
When someone - me, for example - wants a quick introduction to a lightly traveled field of study, it's not easy. I know no one in the field, I want a beginner's primer, and the reviews and previews tell me next to nothing. So I flail, I grasp at a few titles that I think might help, and hope for the best.
(If you didn't know already, hope is not a plan.)
This book assembles a number of advanced research reports, current at the time of publication. Not the thing for someone who's barely sat on the bike, let alone taken off the training wheels. You might criticize this review for not addressing what it is within its subject matter; I reviewed it for what I needed from it. You, deciding what you need to know, should weigh your needs against mine in understanding this evaluation.