To calculate the overall star rating and percentage breakdown by star, we do not 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.
Quite effective but need to have variance in design. Can learn from the Japanese $2 shop where different designs for different requirements.
It will be useful if the Ninja delivery can also call 6 hours before had to let us know about what time it will be delivered so we don't have to leave the delivery outside the door and risk being stolen.