High praise from Stanley Kubrick
Stanley Kubrick praised All that Jazz as one of his favorite films.
While Roy Scheider's performance is excellent and there are a handful of memorable moments from the supporting cast (especially the underrated Cliff Gorman as a Lenny Bruce stand-in), I don't see what Kubrick or anyone else thought was so great and ground-breaking about this movie. Scheider holds the film together as a character study, but there have been many other character study films that I found much more engaging (for instance, many of Coppola and Scorsese's films from the same decade).
For those on this board who are fans of All that Jazz, what am I missing?