I really want to like No. 6, but it's hard. The setting is interesting, the characters started out pretty good and not your average cliches, and it's got a pretty cool look to it, but, man oh man, is it moving at a GLACIAL pace. It's a ten episode series and by episode six we still don't know ANYTHING. We don't know why the city of No. 6 is so bad [other than vaguely Orwellian leanings], we don't have a villain, we don't know anything about this mysterious disease that's killing people or where it came from or where it's going, we still barely even know anything about the characters. Sion is kind of the good guy, but he hasn't done anything at all and hardly has any real presence in the series. Nezumi is vaguely antagonistic at times and maybe homo-tastic for Sion at other times, but we don't know why he hates No. 6 or really anything at all of his back story.
There are four episodes left, FOUR, and there's barely been any movement of the plot.