Once relegated to the back corners of television, documentaries have leaped into cinemas in recent years. But as box office prospects level out in the aftermath of high-profile "blockbusters," is there a future for the theatrical doc, and what role do critics play in making or breaking films? Eugene Hernandez, referee with debaters AJ Schnack (Kurt Cobain About a Son), Nanette Burstein (American Teen), Andrew O'Hehir (Salon) + Arne Johnson (Girls Rock!)