I'm not a big fan of Metallica by any means, but I loved Some Kind of Monster. I still watch it occasionally. The guys in Metallica are interesting characters and it's fascinating watching them operate during this time. I find "making of" docs interesting, but I almost prefer the ones that are made for bad albums. I like to see what went wrong. SKOM is good in particular because not only do you get what went wrong, but I kind of understand the album better after watching it. You can see what they were going for and why it didn't work.