2 and 3 star reviews. 1 star reviews, in my observation, are consistently along the lines of "UPS left the package in the rain! 1 star!", which has fuck all to do with the product.
Also people who don’t seem to understand how the product, their life and the universe in general work. The “can’t make coffee from cat litter, blames Obama in all seriousness, two typos per word” kind. I always wonder how these people look in real life and if I meet some of them on the street.
Its the outcome of gutting the educational system, poor methods of teaching (instead of teaching critical thinking they teach how to take the test), and just the fact that in a country of ~332 Million the bottom 20% could be like 67 million people(the bottom 20% is not a direct correlation but still you get the point).
Such things are still part of the overall purchasing experience, though. If I'm about to order a product online and for whatever reason there may be delivery-related challenges involved that others have experienced, I'd certainly like to know beforehand.
In my experience its always best to leave negative reviews in 3 star reviews. 1 star reviews get buried/removed, but if you let that criticism sneak into a 3-star review it's likely not bad enough for the platform to notice.