nypost.com — MOVIE REVIEW MARLEYRunning time: 145 minutes. Rated PG-13 (drugs, sexual situations, violent images). At the Sunshine and the Munroe Film Center. Kevin Macdonald's documentary about Bob Marley fulfills its great-man agenda. Go in convinced that this towering reggae artist had glaring personal flaws and that the music-documentary format is a bore, and it won't matter.