Just finished watching it. The show had a lot of highs imo. It does have a ton of pacing problems (some scenes go on forever like the one with Sun and Will checking documents, some overt sex scenes that don't add much, and so on), and some of the plotlines took a while to get going, but I was still engaged despite its problems.
Most of my friends were lukewarm on it as a whole (haven't spoke to them about it yet since I was still watching, but it's the impression I got from FB posts, etc). Two of them even said the ending was crap, which now I think is just weird since the final episode was pretty great. Anyway, I'm happy this show clicked with me.
I felt increasingly invested in all the characters with each episode and nearly cried a few times in the second half of the season. Capheus scenes would always bring a smile to my face. Him, Sun and Kala were my favorites, but the whole cast came into their own. The action scenes were fun, and I dug all the "oh shit!" and lol-worthy moments.
What I really loved were the themes of tolerance and the celebration of differences between people. Yeah, it wasn't subtle, but I can't fault a show for trying what they did here. They aimed high and I felt that, aside from some bumps on the road, it all flowed naturally, sometimes even beautifully.
I hope it gets renewed. I haven't read any specifics, but it seems to be pretty expensive to produce. All in all a very interesting and fresh show, with some faults that can be easily fixed in a second season.