Do NOT watch this anime if you want a fun shounen anime with clear "good" v "evil" factions who fight on equal terms.
This show was a fairly realistic portrayal of what would happen if a gang of murderous child soldiers tried to overthrow the government. The characters are complex and likable. My main complaint is with the character Juliet who seems like she could have been a lot more interesting, but was kind of neglected by the writers. Her character growth is very subtle and mostly happens in the final episode.
The overall vibe is much more of a mafia-style than the traditional gundam rebels vs. the man. Some of the character deaths are shocking and reflect this - be prepared.
The ending is very bittersweet but also very satisfying.
Would highly recommend this to people who watch things a little more closely, it will be less enjoyable if played in the background and only half payed attention to.