Reddit reviews are generally a pretty good source to find out what the flaws of a product are. I like to work out what the most common ways the product fails and how possible it is to fix them. I made the mistake of buying a pair of skullcandy headphones and after a month the plastic cracked and then I checked reddit and saw pretty much everyone who has this pair has had the same bit of plastic crack.
I think forums in general (not only reddit) are the best sources to find realistic info about almost any subject.
Holiday resorts, cars, electronics, movies, education and more.
You get a lot of subjective opinions, just like here. But all together they form a much better overview than most text or video reviews
The problem is they do not work for items that are niche. If you find anything, the chances are the review is not in depth or way too subjective and potentially from a person without experience in comparing like products.
Getting a list of hard faults is useful though not exhaustive.
There's the other extreme, relying too much on direct measurements, which can happen at highest end when we don't know which measurements are relevant in what way. (Examples would be mostly luxury - audio equipment, cars, yachts.)
A specialist may be required to make sense of these and they are not easily vetted or found.
