Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
This set is great value for the price (I paid $10). The box is quite heavy compared to others at the same price, and it has a lot of pieces in it and instructions for 3 things to build. It feels heavier than other boxes at $20.