All of them! Yes all! I know I don't have a Warlock yet but all! Want a super gun that takes out enemies and Oracles from far away? Use Golden Gun Wanna slash those enemies and clear the house in a few seconds, or, go invisible for too long to revive your fallen teammates? Use Arc Blade Wanna do your own earthquake and leave no one alive? Use Fist of Havoc Surrounded by aggressive enemies? Use Ward of Dawn and generate tons of orbs for your teammates Got trapped in a corner with no ways to run? Wipe everyone with your Nova Bomb Died in a Hard Mode Raid or a Nightfall? Use Radiance and then burn the living hell out of your enemies and take your vengeance All classes are balanced and all of them are useful, it's just about timing.