I usually take the power (whatever power is offered, not just auras) when initially available, while leveling, and then respec in my 30s where I can shed the unwanted power. This way I get to experience it and see if it works with my play style and enhancements. Then I know specifically why I don't like it within that powerset and my build. That said, there are only a couple powers you have to take, after that there are so many pool powers as alternatives you can make that aura your own T3 or T4. I guess all this to say "what do you want the devs to change?"