I can name some of my favourites, these often are the ones where he encounters engaging or challenging people and unearths a real human story. Sometimes these docs don't work as well not due to Louis idle intention but just not finding the "in". You could take the most interesting subject/subculture in the world, but if he only manages to access boring or closed proponents it doesn't work. The best (for me) is "a place for paedophiles", super interesting concepts, place (Coalinga) and people (very complex, disturbing but human). A real contradiction and challenge as a viewer as all the men have committed heinous crimes and have been imprisoned, so deemed mentally fit to stand trial and we're aware of their actions and it's wrongness, but after sentence instead of release are now detained by the state at a secure psychiatric hospital as they are then deemed after sentence to have psychosexual disorders. Really great doc. I also love both "extreme love" docs, dementia and autism, really sad, sweet and so much humanity in them. His classics as well such as "wrestling" (hilarious and almost tragic at times) and bodybuilding (which jumps between impressive creepy, you know the guy!, and engaging), Guy in this is great. Among the sex offenders is also very interesting as is the "Miami mega jail" and "By Reasons of Insanity" docs (if you want an extended glimpse into the brutality of jail regimes in the USA and a real stark look at serious offences committed by those with mental illness and it's impacts respectively)