I sometime wonder if they really play their game. It's not that the titan is underpowered that much, it's just that everytime they have a chance to even things out, they miss by a mile. I have killed over 7200 warlock and more than 8800 hunters for about 5600 titans, it's not hard to tell which class is less played in crucible. And if there is a thing that is sure, it is that no matter what FPS you play, if the PVP community play less with something by a quite big margin, no matter if it's gun or class, it is because it is less efficient.