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.
It's a great story, if you can get past the constant grammatical errors throughout. A few small inconsistencies, but overall, if you have an extra $20 lying around, it's a good read.