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

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.