One-offs, maybe, but trends are less likely to be fake. For example, when buying a dryer, I looked at many 1-2 star reviews for each product to spot the problems that most people reported. Finally I found one where the only problem frequently reported was that the lint trap would snap in half after a couple of years, because of the plastic hinges. No other problems, and the replacement lint traps were easy to acquire, so I could live with that.