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.
This is a very nice glass. I agree with the purchaser review that said she was disappointed that the etching was too close to the top of the glass instead of being more centered on the bowl of the glass. It does seem too high and off-centered. If not for that I would give it 5 stars. Very nice!