Spoiler:
I've never had a documentary make me feel so ambivalent about something. I think I took a different message than the filmmakers intended. They seem to think that Avery is 99.9% innocent. I'm still processing my feelings about the whole thing but right now I'm going with 100% chance that the state shouldn't have convicted him given their case, and at least a 40% chance that Avery did it, and an over 60% chance that someone in the Avery clan did it.

Also I find it incredibly likely that some of the evidence was planted, but unlikely that the bones and car were planted on the Avery property by cops. And the notion that cops would murder a white woman is flatly ridiculous. Steven Avery is the most likely person in the world to have killed her, given the evidence, and her roommate and ex are a close second and third, with Avery's brothers/relatives trailing in fourth.