Just finished the first series. Really strong production values across the board, except the musical score which works well but is mainly underscoring background music rather than feature music. Script is intelligent while not being overly hard to follow, and there is a good balance between information the audience needs to retain for the story-details to make sense. The script is not overly dense with hard-to-follow information, but neither does it assume the audience have shut their brains down into unthinking mode thereby needing every little detail explained over and over.
Cast are well chosen for the main part, some characters develop a lot more slowly over time, but are done with some intelligence by the director and producers. There is sometimes a little too much emphasis on side-ways glances and surreptitious looks and reactions, done sometimes to distract, sometimes to raise suspicion, sometimes to direct our attention (all normal), but does sometimes lack a little subtlety in the directorial execution. My assumption this is done for the sake of an international audience.
Plot is engaging, has enough intrigue to build interest, contains a complexity that is allowed to unfold over time that requires a little patience (which gets rewarded), maintains a pace that doesn't quite keep you on the edge of the seat, but nor does it set out or pretend to try and be people swinging from exploding buildings or planes at 20,000 feet.
Finally, a comment to the few reviewers claiming "anti-american" script, I would recommend watching more than the first opening scenes. This is a story, entertainment, all based around espionage and intrigue. Chinese are keeping secrets, Aussies are keeping secrets, the Yanks are keeping secrets, heck - everyone is keeping secrets from everyone. The plot revolves around exploring 4 concepts - Money, Ideology, Coercion and Ego. It's not even CLOSE to being anti-American, but it also does not paint America as the untainted hero to the world. Surprise surprise, NSA, CIA etc have done some questionable things at different times in history. Whoopdy frikkin' doo. Welcome to Earth.
