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.
1) Paper quality is disgraceful. Apart from the cover, the rest must have been recycled 100 times. 2) My 10 year old son is really into Lego Ninjago and to his disappointment 'after 4 chapters into Pythor's Revenge' there is no sign of Pythor. And he has given up reading. Can't blame him.