It was an interesting social experiment if you ask me. Take a large group of like minded yet individual people, arm them to the teeth, and separate them up into teams. Subtly encourage a need for alliance and betrayal (through rapidly changing, team specific mission directives), and then give a quarter of the players absolutely no guidelines for their allegiance. It's a recipe for sweet sweet chaos. There is no way to anticipate, or control, how each team will react. No one out there was an NPC, so every individual's actions, whether or not they were sanctioned by their respective teams, can have any number of unforeseen consequences. With a static "world" setting (team hq's, bank, ect.), there can be no telling how people will react to the situations that arise, be it from assigned missions, or just personal decisions. The outcome was beautiful this time. I can't wait to see what comes next.
