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.
The product is fine as I already had one for my kid. The 1 star is given for delivery and handling. The screen had visible scratches and I had bought it as a xmas gift. Something to consider if you are not buying for your own usage