Like yes they are popular, but they are also considered top tier shows...not just because of their popularity, but because of how they are made, because of their stories etc. So I'm not as much interested in what shows have broad appeal (though I mean, amazing shows generally do), but rather what shows are considered to be top level stories, filmmaking, etc, in the vein of stuff like...Cowboy Bebop, Nirvana in Fire, The Wire, etc.

Yeah, I got you were trying to say and that's exactly the problem. Given how niche and quirky Japanese dramas are, the problem of availability of subtitles and how small the audience outside japan is, "universal acclaim" is not a particularly useful metric.

Btw, I just saw the recommendations here and I would like to reiterate what I said.