For what it’s worth, while I loved Pulp Fiction, and have watched it several times, I did not like what I saw of the Kill Bill movies, Django, or The Hateful Eight. (I don’t watch all of movies I don’t like.) Don’t recall if I saw Jackie Brown, but maybe not. I should check it out.
So I don’t consider myself a Tarantino fan, per se.
I find, at least in recent years, for both books and movies, to me the characters and atmosphere are more important than the plot. I’m not sure there even is a plot in “Once Upon a Time..” But, there is plenty of atmosphere, character, and.... action, too. (And humor, big time. It is very funny in places.)
One review I read described it as a western.
I think many — not all, of course — of those here who think they don’t like Tarantino will like this particular movie.