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.
How hard is it to build this thing properly? This is the worst item i have bought online in my life. The quality is terrible and its impossible to keep it in place. The railing keeps coming off. After adjusting it a few times a piece of plastic broke and now its useless.