What's the most disappointing product you've ever received? No matter how carefully you vet the seller, sometimes you're going to end up with a subpar product. This seems to happen constantly to people who buy things online, where tricky photography angles can be used to disguise subpar products. One person bought a cat sweater, only to realize it wasn't a sweater at all. It was a sweater print , printed onto some cheap fabric. It looks like the kind of fabric people wear for an ugly holiday sw…