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.
These didn't work for more than five minutes. I saw the previous bad reviews but thought how bad could they be. The noise coming from the frustrated kids in the back seat was worse than just letting the movies play over the speakers.