It was well done. A good mockumentary. *Very* meta.
Aside from the background level humour of dicks and handjobs and people talking funny, pretty much all the humor comes from the making of the documentary itself.
The documentarian being so po-faced and earnest when dealing with such silly subject matter. Also at times being extremely inept or completely inappropriately exposing peoples intimate secrets despite them being only tangentially related to *the case*.
Quad9Damage Very much agreed, especially the episode where he's reviewing the video footage from the party. I love his casual air of indifference when talking about the kid with his head stuck in the banisters, the girl crushing up Adderall, the wanton destruction of all the grandmother's personal property. That and he has the general acumen of the average high school A/V room student, completely clumsy and unprofessional.
Mr. Purple Cat Esq. Yeah though he's still quite a sympathetic protagonist though. His zeal and passion for the project is unquestionable + he is *trying* hard to be professional. You get the feeling he may go on to do great things.
A lot of nuance in this superficially, very silly seeming, show. Also lots of funny little touches.