That's how I feel about music docs in general, at least the ones I've seen on streaming services. If it's about a band, it's often 60-90 mins of people talking about how awesome the band was. That's nice and all, but it gets tiresome. I haven't seen this drumming doc, but it seems like it's basically drummers playing and talking about drums. This is something I can experience by spending a couple hours on youtube, and that way I can seek out the players that interest me. Just like a fictional movie, a doc has to have a story in order to be compelling, and for it to be really interesting, it needs some sort of conflict. I have seen some great music docs like "A Band Called Death" and "Searching for Sugar Man," but these seem to be few and far between.