There definitely are times when the sound seems out of place (subbed), but the scarcity of music provided excellent breathing room for the characters and the use of photography throughout the series.
As more of an aesthetic complaint, the intro did not seem to fit with the tone of the show entirely, but I would be hard-pressed to name any anime that has an intro that matches its show.
One thing I must applaud about the show is its diversity of cast. In so many shows, the setting is almost exclusively Japan, with the cast almost exclusively Japanese. Of course, this makes sense, but having a show set in a near future that does not take place in Tokyo and includes a host of international characters certainly helps this particular story more universal in its approach.
