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.
Great little thing that kept me entertained on flights. Delivery time was slow but it's definitely worth it considering everybody else was selling the older version. Now I just want a bigger game library!
The device itself is amazing the only sad thing was that it was a US model and hence came with a US plug which by the way is against the law in this country but I had no time to return it as it was a gift for my son. Ended up buying another plug which fits the wall sockets.