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.
Quality of the product is good. But it does not fit in the belly area as shown in the pic. It is too large there. However, it looks good if tuck in the trousers or jeans. Yellow buttons don’t go well with the rest of the shirt. They should have been blue.