Nightstalker for team modes because of the unbeatable survivability and zone grenades. Some Warlock subclass (preferable Storm) for Rumble because of the Melee and recovery. Simple as that. A side note: Played Rumble Supremacy with my Hunter this weekend and you really feel how fragile you are. Because you have to "go in" to get the Crest, the weak armor, bad melee and even worse recovery really hurts.