I agree. Curtis consistently makes films that are a lot more about opinion and interpretation than anything else. He is not bad with facts, but he does have a tendency to present the viewer with an avalanche of data points... only to later express what is basically his opinion, often not even directly linked to the facts that have just been presented.
With that in mind, I still find his opinions interesting, original and provocative. Also, his films have some of the coolest imagery ever — if I recall correctly he used to work at the BBC, dealing with their archives.