Will these be separated by seller?
Last I checked there was no way to review a seller on Amazon (or if there was, it was so well hidden that a week of effort and calling customer support only got me a refund). Rather Amazon lets you review "products". Given that a "product" can differ between sellers (either because the products are of varying natural quality like with used items or because one seller straight up sells fakes and broken items), it is much more useful to review the seller than the item.
Knowing that DVD copies of Jurassic Park are frequently returned (or that Jurassic Park has amazing reviews) helps me not one iota when I am buying from an unknown seller who might be sending out pirated DVDs with always-on Arabic subtitles.
Until Amazon breaks down user feedback (reviews, return rate) by seller, I will continue to urge friends, family, (and everyone else) to stay away from Amazon at all costs. You just never know who you are buying from or whether they are trustworthy.