One word that comes to mind with Red Faction? Destruction. The series is known for its impressive amount of freedom when it comes to blowing up buildings and digging holes into walls, so Volition have created a mode entirely dedicated to doing just that inRed Faction Armaggedon.
As the above trailer shows, Ruin Mode lets you run around the surface of Mars, blowing the hell out of anything that stands in your way. You can pick your own weapons and then set about toppling structures. Points rank up so that friends can compete on leader boards in Challenge Mode, but a simple Free Play mode also allows for some relaxing crashing and smashing.