Really, because both seasons are out and available, I'm going to just repost my review from the first season below. I will say I felt they kicked the action up a notch in this season, and you get more interesting missions for Celestial Being. Read below and enjoy the series, this is the best Gundam has to offer IMO.
I really love the story with this one, I think it draws you in and makes you really like the characters. I really like it when they blur the lines between which side is doing good, and which side is doing the most harm. The mobile suit fights are amazing, I think this series does some very interesting things with their Gundams that you don't expect. The animation, really top notch. I really have a hard time finding something negative about this series, so I wont struggle to do so.