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 really great resource. Gives lots of tips and tutorials on character design and insight from industry professionals. This is really more of a book than a magazine because of the high quality of materials used. My Amazon purchases convinced me to go ahead and get a subscription from 3D Total. You will not be disappointed with any of these magazines!