The fellas over at Ruffian Games know that if something isn't broke, you shouldn't piss away valuable time trying to fix it. Just make the weapons bigger and add some helicopters then throw in a more robust multiplayer. I did some hands-on time with Crackdown 2 and it's new deathmatch modes.
Free-for-alls are simply put, insane. Agents leaping from building to building being shot out of the sky while grenades explode in the streets below taking out those who thought they were safe by avoiding the chaos above them in an orgy of death and violence. Ah, how I've missed this game.