Worth watching, but take it with a serious grain of salt. The series was interesting at times, particularly the earlier episodes, but later episodes focused way too much on Louis Armstrong and I wish Burns would have tracked down more veterans of the hard bop era rather than having the Marsali opine endlessly. The final episode was ridiculous: the slights against Miles Davis and Cecil Taylor, ignoring the loft scene, turning Dexter Gordon's return to the U.S. into High Noon, etc., etc.
I think George Lewis sums it up best in his book about the AACM, A Power Stronger than Itself: "Newer histories of the period often uncritically recapitulate the corporate-supported tale told by the heavily funded Ken Burns Jazz series, a story which goes something like this: John Coltrane went mad in 1965 and a mysterious virus that he and others were carrying killed unwary musicians until Wynton Marsalis arrived in 1983, carrying a powerful mojo from the birthplace of jazz that put the deadly germ and its carriers to flight."