That or customers write reviews for things like the way the product was packed, or the shipping method that brought the product to their door. Not only does it

That or customers write reviews for things like the way the product was packed, or the shipping method that brought the product to their door. Not only does it not have to do with the product, but same SKU is often sold by multiple sellers. So your packing/shipping experience will differ depending upon whether you bought it "sold by Amazon," "sold by $COMPANY and fulfilled by Amazon," or "sold and shipped by $COMPANY." A rating for a book shouldn't be affected by the fact that one buyer ended up buying it from some rando third party retailer who fulfilled the order by packing it poorly and sending it media mail.