Ken Burns's Jazz According to Wynton Marsalis should've been the actual title.
Ha - that was one of my complaints!
My primary issue is that the entire premise of the series was that jazz is some kind of completed work that was finished in the 1960's and now belongs in a museum to be admired for what it was. Not something that continued to evolve beyond that point.
The series spent 9 episodes from roughly 1920 to 1960, then one single episode covering 1960 to 2001 (the year of its airing). Because of this, entire jazz sub-genres are hardly mentioned if at all. Avant-garde? Fusion? Jazz-funk? Apparently they didn't exist.
And Wynton Marsalis, oh boy. If you are a fan of his you are going to love the series, because it is seemingly all Wynton, all the time. And even more egregious, he is basically presented as a sort of "savior" of jazz since it apparently died in the 60's. One jazz writer had this to say about it: "Wynton's coronation in the film is not merely biased. It is not just aesthetically grating. It is unethical, given his integral role in the making of the very film that is praising him to the heavens."
My advise is to watch the show with the thought that this is Ken Burns'/Wynton Marsails' send up of jazz and as a good introduction to the history of the genre. Beyond that, you'll need to dig deeper to find the things they were unwilling to include or talk about.