I thought this was really good -- I saw it about a year ago at a festival without knowing anything about it or the Weather Underground itself, and found it qutie revelatory. It's director is also the only Academy Award nominee I've ever communicated with via e-mail. Yay me.
I just need to see Balseros and I'll have seen all the documentary nominees this year. I think that's a first for me, at least pre-awards show.