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.
The knocker is sturdy and good for the main door. It is sleek and won't look ostentatious on the door. Ensure that the nails used to secure the knocker are drilling through the door so that it won't become loose because of the weight.