Rock docs are often shallow, self-gratifying wank fests made by bands with zero pedigree. Maybe that's why this two-and-a-half-hour punkumentary about NYC's ultimate rockers resonates so much. Sure, filmmakers Michael Gramaglia and Jim Fields give us stashes of great footage from punk's Bowery genesis and in-depth interviews with most of the major players, but they also dish on the dark shit. Mainly, how commercial failure, personal tensions and a murderous work ethic turned a fiery young band of misfits into a group that eventually became a dysfunctional and under-appreciated caricature of its former self. Unsettling and essential.