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.
I gifted this product to my wife and so far she is happy to use it. No signs of irritation. She is excited to continue using this to see the result in a month or two and asking me to "surprise" her with other Tree of Life products.