Well, let's see...
They interview everyone who's ever been in the Ramones, as well as managers, roadies, relatives and so on. The bulk of the interview time goes, quite rightly, to Tommy, Johnny, Joey, and Dee Dee (obviously most of it was filmed before Joey passed away.) It starts with descriptions of gowing up in Forest Hills, Queens, which looks mainly like a forest of Soviet-style apartment buildings from what we see. Then through the formation of the band, the career, the breakup, and finally the induction into the rock'n'roll hall of fame in 2002. Along the way there's lots of cool (to a fan) concert footage, and I learned a lot of things I didn't know, like that Joey grew up with Obsessive-Compulsive Disorder. The succession of drummers gets to be very reminiscent of Spinal Tap, and Dee Dee trying to become a rap artist is flat out hilarious. From a filmaking standpoint it's nothing remarkable; the interest is all in the subject matter. It reminded me of just why I liked them so much all those years ago. I STILL like their first few albums, actually, but don't play them as often as I used to.
Another thing. Everyone always used to say how simple and easy their music was. Just two or three chords, right? Then why hasn't ANYONE, not even any of their imitators, ever sounded like them?