A major drawback with eBay is that there are no reviews by past buyers available for a product on the product description page . This makes it difficult for a prospective buyer to buy a product with the confidence that it will be a good one. This absence of a provision to leave reviews for a product by past buyers seems like a deliberate policy decision by eBay to discourage negative reviews and encourage more sales on eBay. This is not a very transparent business model and it is unfair on the buyer.
Also, some sellers keep the details about their sold items private, which again makes it difficult for a buyer to check the feedback given by past buyers on any particular product. I don't understand the reasoning behind eBay making this provision for sellers to keep their sales history private, other than profit-making. This again is a non-transparent and unfair business model.
The model followed by Flipkart is great in this respect because the product description page of each of their products has a provision for past buyers to leave their review on it.