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.
Just a reminder, if you're using regular ol' 7 1/8"x10 1/2 poly bags (like Ultra Pro's regular sized bags), you are FAR better off with 7"x10 1/2" standard comic size boards, no matter the comic you're bagging s, b, or moderns. Unless you want one of your edges exposed at all times! Just thought I'd offer the tip.