Otaku: Leaving comments on one product will not work because the vendors will only leave the positive comments. Look at this note that appears on top of the comment box: This form is for buyers who have used this product and want to communicate to the merchant. Please feel free to leave your comments. The merchant will receive an email notification when you have posted your comments. These comments will not become public until the merchant approves them. So the last sentence said that the comment will not become public until the merchant approves them. SO it will be impossible to have a negative comment be public.