Originality: 10/10
Fun: 5/10
Usefulness: 1/10
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I love defiance (mostly for concept), but it is a situational benefit at best. At worst, it will get you killed.
I've been playing with low level blasters for several days on test, and have found that using Defiance pre-level 10 can help you solo quite effectively. All you need is a pocket full of awakens.
However, after 10, I doubt if we will see much use of this power... as a purposeful part of strategy, at least. The benefit isn't worth the debt risk. I'm sure it will help turn the tide of battle once in a great while, and that will be just fine, but it won't "save" the blaster AT by itself.
Of course, it isn't intended too.
My only concern is that it will be misunderstood by the general playing population and overly-effect play style in groups... with defenders not healing etc...
I guess it will be up to the blasters to educate the rest of the player base that defiance is best if just forgotten about after level 10.