If you watch the Metallica doc, it becomes abundantly clear to everyone but the band themself that they should hang it up. The just don't enjoy being in it; it's basically just a day job now. However, I suppose its worth it to take the stage and play to at least 70,000 screaming fans every night. Its gotta be quite the rush.
Also, I realize St. Anger is supposed to sound raw, but c'mon. I listen to music my friends recorded in their attic on a 4-track, so I'm not unfamiliar with "raw" sounding recordings, but I've never heard a snare that sounds like a garbage can lid suspended from a ceiling when its struck. Still, there's a few decent riffs on the record, but far more bad parts, and not one decent whole song.
