I wonder if it has something to do with the stigma of so-called genre films
I believe so. And the numerous assumptions that go hand in hand with it: f.e. that film as art is bound to "real authors", who have to be independent to be free to express themselves, etc. Hence the theory of auteurs from the 60´s, which tried to upvalue a lot of american genre directors like Nick Ray et. al. by stressing the genre bending (originality) of these directors, and diminishing the genre aspect (stereotype) at the same time.
I consistently find in Suzuki's best work lots of interesting characterizations, moral and social subtext, humor, and striking visual appeal
He sure is a very good craftsman, and his films are perfect entertainment, with some striking narrative twists and turns, an interesting elliptical editing technique, and popart-influenced colour experiments. All this makes for his originality. But when he´s evaluated as the big anarchist with political insights, expressed in carefully hidden subtexts, I would say: overinterpretation, myth-building. Social comment wasn´t his concern. The content side of his films is his weakest point. But on the other hand, he had to deal with run of the mill scripts, and was bound to make utterly boring scripts visually interesting, in which he succeeded IMO.
It's an idle question whether Suzuki achievements bested Ozu's (et al.); that's not what he was trying to do
Absolutely! I have the feeling, that one has to protect Suzuki against his fans, who want to make him something, that he never wanted to be, and, perhaps couldn´t be, and he´s the first one to stress this in interview after interview. In sum there´s an over-stressing of the formal aspects of his films.
I think we need to ask whether the same criteria can even be applied.
No, I personally think, that this is unfair. But the starting point of this thread was the overrepresentation of Suzuki by Criterion. And I believe it is not unfair to say, that he´s overrepresented in the context of the Criterion catalogue. The only additional Suzuki film I want to see in the CC would be Zigeunerweisen, because I feel that this film would really open new perspectives on Suzuki.