I went there many times in the late 70s early 80s during the golden age of arts funding. Odd that the documentary didn't mention jazz at all, just alternative music. During the various Camden Jazz Weeks/Camden Festivals I saw among others, AEoC, Cecil Taylor, Sam Rivers, George Coleman Octet, WSQ, Blood Ulmer, Freddie Hubbard, Chet Baker, Carla Bley Orch, Duke Jordan, Air, as well as a number of UK bands in support. Always very good sound and a good view of the stage for any seat. I don't recall it being anywhere near as bad as the documentary made out during the time of my attendances. My avatar photograph was taken there.