Medium is somewhat looked to has having the worst of both worlds - the light and heavy. Given that is is slower than the light and can't take as much punishment as the heavy - just what good is it? Well, it is a good armour to use around your base for defense. You can quickly maneuver around the base turret farming (setting up and repairing turrets) and also repair outdoor structures without fear of getting killed as quick as a light would.
You are also equipped with another weapon and grenade to add to your arsenal. Not many people are sold on the hoplite armour, but it does have it's uses.