[Suicide Junkie]

What if each side had a specific advantage and counter?

So you have to try to figure out whos going to attack you and then build the appropriate type of defense.

Like crystalline to stop the organics, PDC ships to stop missile guys, etc etc

Give each side only one weapon tech, so the missile guy can try do attack whomever they feel is most vulnerable to them (if they can figure out what the other players have).