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.
my foot size is 42.5-43 EU, i ordered these nike slides in 44, because i tried ordering reebok and adidas ones in 43 before and they were small. Yet these nike slides were even smaller than the other brands i ordered before, although it was one size bigger ! one more thing, it does not look genuine at all!