Forget Firefight. We need a "Beast" mode

Everyone’s complaining about how Halo needs playable elites. Gears 3 had a mode where they took Horde and made it so you played as the Locust. You could play as a grenadier, sniper, wretches, berserkers, etc by earning points throughout the match. You could take this idea and allow us to play as grunts, jackals, elites, brutes, hunters, etc.