The pacing works for the start of the show, but at the half-point it feels as the studio realized "Crap, we are out of time" and shoved a dozen of undeveloped, and sometimes even un-introduced concepts, for the rest of the show's duration. It dished out way too many side-plots & characters but didn't provide any meaning to them, let alone the fact the show just kind of 'ends' without solving anything. Hell, it may be the worst anime ending I've seen, and anime isn't exactly known for it's good endings.
The premise of this show required 110 episodes, not 11- and it was outright terrible because of it. Sometimes simple is best, No.6 Proves that if nothing else.
