We should probably clarify what we are talking about here. People do feel they deserve products they aren't being offered, or to get things for cheaper than they are required to pay, or to get things more quickly than Sideshow can give it to them. And that is a kind of unfortunate entitlement that I see all over the place. People don't "deserve" for companies to produce whatever it is that customers want them to on the customer's terms.
However, like Green says, if you essentially enter into a contract that Sideshow will deliver you a product they advertise for sale, and you get something faulty, with major paint problems, etc., then that's a justifiable complaint IMO.