Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
I gave it a 4 ONLY because we didn’t get to open the box at our house. Everything looked awesome and as far as we know and were told by family, it’s a fantastic little set. Great value for what you get.