The simple answer is that The Department is going to have a load of replay value because it's three games in one.
A. Players cooperate to investigate and destroy a fabricant terrorist cell. This is where the fabricants are controlled by the game by means of dice. Think of this as a free form Arkham Horror game. This is the mode demonstrated in the Sample of Play.
B. As a straight up miniature wargame where one player takes control of a group of DFM agents and the other takes a gang of fabricants to battle it out on the streets of 2060's America.
C. Players can play The Department as a traditional pen and paper RPG with a GM. We'll be providing a long list of NPC's and more detailed rules for social interaction beyond the investigation. While we really like using miniatures in RPG's, there is no need if you don't want to when playing this mode.