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.
Highly likely a fake Samsung card!! I have several Samsung MicroSD cards that worked well for years, even able to playback 4K movies without issues. However, this card can't even play 720p videos without shuttering. Forget even 1080p, Speed is too slow.