Oh man, I read this and cracked up because of the accuracy.
I, myself, have a 50 Spines/Regen scrapper who is the tank for my basic team of me, a rifle/Energy blaster, and a Empath/energy defender.
My build not only has all the defenses, but I took all the defenses from the power pools as well.

It was needed for that group and we get along well with it. I totally tank everything!
Course, I get irritated at the kill stealing blaster.... hehe