I find reviews useful anyway. I simply ignore the "good" reviews and always look at the worst ones. There are three kinds of bad reviews - people who had random bad stuff happen (postal service broke it) that is irrelevant and think everyone should know - people with some sort of vendetta (possibly disgruntled employees, or competitors, or crazy customers) - and finally, people who actually had a bad experience that might be characteristic of the product's quality or design.
If the third category can be used to construct a narrative about something that is a deal-breaker, then that's the information I'm looking for. Of course, it has to be taken in context of the competitors.
My expectation is that the best products have some type (I) and type (II) bad reviews, but no type (III). Almost as good is something with type (III) that are about something that either doesn't matter to me or is actually a positive from my perspective.