I have a theory that this happens in Amazon to cheap products (e.g. it's great the first couple months and breaks after 6, but the review is made several weeks

I have a theory that this happens in Amazon to cheap products (e.g. it's great the first couple months and breaks after 6, but the review is made several weeks after the first product). The reviews mean less as a result, and the only good signal is a heartfelt review from someone who has used the product (or in Glassdoor's case, has worked there a while) a while (and it's worth scrolling pages of the meaningless review to find them).