The husband and I watched it this weekend (on Netflix, surprise!) and it was pretty entertaining.
I've always been into campy horror films and the grindhouse films they talk about in this documentary were the precursor to that genre. I was familiar with some of them, but not many.
What I love about watching documentaries like this — meaning, entertainment-based and about the evolution of American subcultures ("Behind the Burly Q" is another good one) — is that it shows a time when something in entertainment was actually taboo. Which doesn't ever seem to be the case anymore, for better or worse.
And I think that's at least one reason I get so interested in some of the retro styles and trends of the early 20th century. It's interesting to see how things that seem so tame by today's standards were regarded when they first broke onto the scene.
So if you're into that sort of thing and you're interested in learning a bit more about the evolution of the film industry, "American Grindhouse" is certainly worth a watch.