Titan Defenders are like Death Magnets. I want desperately to like the defender but here is the problem. You are essentially a sitting duck. Nothing comes in nothing goes out, its just a stalemate. The mechanics of this class need to change. Other Supers break the bubble with no repercussion and you are dead. The only thing defender seems to work for is control and even that is debatable. Perhaps outgoing damage is reduced? Or at least don't let the damn hunters arc blade right through it. They should cancel each other out. From what I can see the ladder is as such:
Hunter
Warlock
Titant
English
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The bubble is amazing for any type of objective pvp. You lay that down on the objective with your teamates and it creates a hell of a problem for the enemy team. With the right skill speced, it takes more than three hits for my Arc Blade to kill a Titan in his bubble. In which I usually end up with a OHK shotgun to the face.