I should mention up front that I am not particularly a John Lennon fan. I don't dislike him but am somewhat indifferent to his work...especially his work post-Beatles. However, I watched this film because I am a huge fan of PBS documentaries...and in "American Masters" is one of my favorites.
The film is about John Lennon and his life when he moved from London to New York in the early 70s. Among the many topics covered in the film is his marriage to Yoko, his anti-war work, the Nixon administration's attempts to deport him, his separation from Yoko (with his subsequent spiral into drinking and being a jerk), his studio work as well as his later years and, once again, fatherhood. The way I see the film, it's a gradual evolution until he became a person most of us could really like...at which point he was murdered.
The documentary is made up of the usual interviews and film clips but what makes this one really neat (and a tad spooky) is that so much audio of Lennon talking and recording and outtakes are spaced out throughout the film. It's interesting to hear alternate versions of his songs, his commentary or even his saying goodnight to his young son. All in all, a very compelling, well made and interesting portrait of the guy from about age 30-40. Well worth seeing.