When I first saw the idea of Defiance, I was completely blown away at how random this new power seemed. It made no sense to me why Blasters should have some kind of inner rage. Don't we all have that? I feel this singles out Blasters and makes us special in a bad way. For the record, I play a blaster.
I suggest that Defiance be a pool power set available to ALL archetypes. Why all archetypes? Well let me ask you, aren't we all capable of great strength and heroism in times of dire need? Why are only Blasters being given an ability which seems more suited to "Duh-duh" barbarians from AD&D?
I think Blasters are cool enough without this ridiculous "Defiance" . The reasoning that blasters almost accomplish their missions but die when the foes' hitpoints are nearly gone is not enough reason to give this skill to one AT. The same can be said for ALL archetypes, that they often die just before nearly defeating foes.