I'd say this is exactly where some kind of web of trust could work. There is a temporal dimension to this too. Everyone loves their new toy just as they unbox

I'd say this is exactly where some kind of web of trust could work. There is a temporal dimension to this too. Everyone loves their new toy just as they unbox it. What interests me is reviews after having used it for a few weeks or months. Amazon has all the data it needs to filter reviews by “people who have actually bought this, review left after n weeks”.