Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
This is a book of short-ish stories from Robin Hobb and Megan Lindholm (the same person writing under two different pseudonyms). I have not much enjoyed books by ML in the past, but have enjoyed RH's books. I found the same this time with this collection. The ML stories were a bit grim in places, but the RH ones were set in the Rain Wilds and surrounds where some of her other series are set, and I really enjoyed those.