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.
Grandson disappointed that 2 of the shelving units are not included in the package. this was not mentioned until we were putting the units together and it mentioned in the middle of the instructions that they were not included!