using solely an imdb rating, regardless for what, as an absolute break point, offers the least meaningful value and is in my opinion the most stupid thing, one can base a descission on.
when paired WITH, and set in relation TO, other critics like metacrirics or rotten tomatoes, the metrics of imdb ratings are fine. used solo, as an absolute measurement, it’s horrible and plain useless.
every cineast will tell you the same. but if you are just watching 5 series in 20-40 years, ofc it’s fine.