The people who are most motivated to write any review at all are the POed ones, so there's always an imbalance there when you check out a product or service.
On the other hand, sometimes it's glaringly obvious that the service or product provider has hired shills to write glowingly positive puff-pieces.
Take Harbor Freight, for example. Their catalogues have little one-to-five star customer satisfaction ratings for some of the products shown. I've never seen an entry on an item which is less than four stars. Makes you wonder how they figured those ratings. (I have noticed their customer service is pretty good, so maybe they're counting how many calls result in resolution versus how many result in vein-bulging outrage or something to get those four-out-of-five star ratings.)
Anyhow, when I review on-line reports or comments, I mainly look for "things to look out for," and generally discount "this thing is a POS" remarks except for the "why" parts of them.
I mean, just look at the reactions when you mention Hi-Point firearms. An awful lot of folks just seem to jump on the POS bandwagon without actually having had one.
So. Negative reviews? Meh.
Terry