The 5 stars are somewhere between suspicious and just not that useful because of people being overly excited and the 1 star reviews is often people just having bad luck or not understanding what the product is and for whom.
Meanwhile the 3 stars I feel are the most sober ones, often pointing out flaws (and every product/service has them), that I can then make a more informed decision whether those flaws are going to affect me at all or going to be a show stopper.
That's why I'm a bit skeptical about the use of sentiment analysis or similar, independently of how well they work. I'm not necessarily convinced that excitement is actually that good a signal. E.g. there are many movies, books, etc that are generally well received but I don't like them at all. Doesn't make the other people or me wrong, I just have different expectations and preferences.
Similarly for tech services I would prefer having a much, much easier time being able to map the systems capabilities and limitations to my use case and budget than knowing whether other people like or dislike it.