It seems pretty simply. If you get whats advertised, you rate it good. If it isn't, you rate it worse. If it was what was advertised, but you figured out that wasn't actually what you were looking for, the rating for the product should still be good, even though you made the mistake of buying it. That's not the sellers fault in any way.
Yes, that is true. But I think it has to be compared to how much you liked this product VS others who do the same thing. Not "I thought this product did X" (but it was never specified for example) and then leave a 4 star review after returning it, or similar cases. Maybe I ordered this thing and thought I would like it, but because of something not-the-fault-of-the-product-itself I ended up not liking it, I don't think the seller should suffer from it.
