I've seen and really enjoyed all his series' (Century of the Self (which I actually think is the best one), Power of Nightmares, and The Trap), but I've often wondered how exactly they should be watched. First of all, I am learning plenty of information when I watch his documentaries. But its also apparent that they are being filtered to a pretty extreme level. His use of creepy music and filtering video to make it look like it would be playing on the reel from A Clockwork Orange can really taint what I think of the information.
People jump all over Michael Moore for the way he cuts his movies' and I've defended parts of his style by saying that by making the movie from his voice, he is clearly marking it as an argument and/or propaganda. You can make the same argument for Adam Curtis. But I don't want to have to.
I watch his movies and they are so well put together with such exciting theses that I want to feel that they are true but he is so manipulative in his presentation. Add to that the fact that they are never to be released in America in any official capacity and you never get a real discussion of what one should take out of his movies. I guess I started by loving them and now I am frustrated by them. However when anyone in life tells me they've seen them, its generally the start of a great conversation.