The ones that bother me the most are the re-purposed catalog entries. They will have 2,000 reviews, solid 4.7 score, but when you look at the reviews, half of the reviews are for a different item. If there are any out of place reviews I avoid it. Practically, it means sorting by highest reviews gives junk first. I don't know if it's a matter of not monitoring, not caring, or not being able to keep up. The fact that there isn't an easy and obvious way to report a listing and review / listing shift is apparently permitted means they aren't trying to keep up.