Warlock: all i think they need is to change fireborn to revive allies instead of themselves. This would make fireborn extremely useful during raids instead of the "don't worry, I can revive myself so I can do something stupid" that it is now. Titan: massive damage reduction, at the cost of movement speed, thus making them into the tank they should be. Not sure about hunters. I don't like the class very much myself, so I never really played it very much.