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've put these shoes to the test. The treads have worn a bit more than they should, but acceptably. They were a great comfy fit in the beginning with awesome stretchy laces, but some sweat saturation caused the elasticity to leave and even after a hand washing, they're still stiff.
But the worst part is the inside. In one shoe, the plastic lining inside at the front has peeled down off the top for no apparent reason and is very irritating to wear. And the soles have fully separated and just slide around with running and jumping activities - very annoying.