Thoroughly enjoyable until the last episode or two. The way it ended was a major letdown. The creators say that the ambiguousness is supposed to be realistic, because that's how real murder docs typically end, but I find that to be a huge copout. Apparently this is getting stretched into a 2nd season, and I don't think this is a show that needs a season 2. I would rather have seen a satisfying, final conclusion. I get that there's financial reasons for prolonging these things, but god damn it sure does tarnish certain series.
Still glad I watched it overall though.