To be fair, it may be, but the Certified Fresh tab of Rotten Tomatoes is what viewers talking about TV have in mind.
To your point, look somewhere applying a touch of curation by quality for a fairer take on what Americans want in a documentary.
https://www.metacritic.com/browse/tv/genre/metascore/documen...
https://editorial.rottentomatoes.com/guide/best-netflix-docu...