Love the Titan, and the bulk of the Hunter and Warlock. Only thing I'd see as possibly changing would be the Supers for Hunters and 'Locks, to fill in gaps in their utility. Hunter Super Idea: Devouring Void- The Hunter throws out a small sphere that, upon either hitting an opponent or travelling a set distance, expands significantly, pulling nearby foes towards it and dealing damage. When the activation button is pressed a second time, the Hunter draws a black hand cannon, firing into the sphere and detonating it, dealing heavy damage to any enemy trapped in it. Enemies killed in this manner are sent flying outwards, where they detonate (Think Firefly/Ice Breaker). Warlock Super Idea: Arc Charge- The Warlock slams a glowing sphere of pure Arc energy to the ground, creating a sizable field around himself, simultaneously bolstering the power of his allies, as he saps the strength of his foes. (This ability creates a large area, signified by a bluish aura and bolts of energy arcing along the ground. Any friendly Guardians in the radius gain massively boosted health regen as well as a nearly-nullified cooldown on their melee ability. Enemies take light, but steady burn damage in the area, as well as being periodically staggered.)