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.
The price is too high for the case of a midrange phone. For the 9D type screen protectors, it may be a bit tight on the phone and push out the screen protector. Also, the case makes the phone too heavy.