Well, here's the perspective of one person who was not at all into Dylan and watched the move: my wife Helen.
She rolled her eyes at the thought of my watching this and was prepared to walk away the first night and call a friend in the bedroom or do something else.
She got hooked in the first few minutes though and watched the whole night, and the next. She thought it was "fascinating." She felt that she enjoyed Dylan's performances more than she ever had before.
This film reinforced my impression from reading "Positively Fourth Street" of how ingenious Dylan was of creating himself anew. He totally ejected his former Bob Zimmerman identity when he went to NYC the first time and especially when he returned, and created the Dylan persona and stuck to it. I really believe that he didn't have that much interaction with his family since. I moved 1400 miles away from my family at a later age and if you did a boring chronicle of my life since you would see little interaction with my family. I felt that this documentary was great living history. I relished in the interviews with the musicians. I relished Dylan's responses to questioning. I relished the footage of performances and interviews. Sure I'd like to see a similar documentary of further eras of his career, but I felt that the choice of this time frame was functional and enlightening.