I loved it when it was being narrated via text on screen. But most of the time it's not, and it can be hard to follow.
Adam Curtis is serving up a lot of symbolism and metaphors and other clever stuff via stock footage and music. There's a lot of subtext. Some of it I get. But a lot of it passes me by because I don't recognize exactly what is on the screen, like there'll be footage of some guy speaking surrounded by reporters but I don't know who the guy is so I can't understand whats being said with the footage of him in combination with the music being played or why the reporters are asking him those particular questions.
What I'm trying to say is, this is a great movie but you need to know a lot of 19th century history, especially american, for it to make sense because most of it isn't narrated. If you can't tell what's on the screen a lot of the time it's gonna get boring and a bit frustrating, as it did for me. I recommend watching Adam Curtis's other documentaries beforehand, they are easier to follow and will, to some degree, prepare you for this one.
So yeah, my problems with this documentary were largely due to my own ignorance. But I'm not that ignorant, so if this is a problem for me it's probably gonna be a problem for a lot of people, especially those under the age of 40.