By Rob Sheffield “Whenever I hear someone damning Paul McCartney,” a voice says early in Man on the Run, “I tend to agree with them.” The person saying this? Paul McCartney. It’s a perfect way to dive into the story of Wings. Man on the Run is director Morgan Neville’s delightful new documentary on one of the strangest chapters in the Macca story: Wings, the weird 1970s band he started after the Beatles fell apart. For years, this was a taboo subject he basically tried to write out of his narrative — the most-mocked, least-respected corner of his career, the case of the Beatle who broke bad. But now McCartney’s finally ready to reclaim the Wings legacy. Man on the Run, out Friday along with an accompanying soundtrack, is an intimate portrait of a rock superstar who knew what the world wanted from him — but decided to rip it up and start over from scratch, just for kicks. “We don’t ‘work’ music,” he explains in the doc. “We play it.…