The more I think about it, the more I realize that this is a recipe for awesomeness! Think of scenarios where you're fighting a boss with some friends and it does some devastating AoE attacks from time to time. If you're talking over Ventrilo, you can be going "GET TO COVER!!".
Or if you're fighting a bunch of archers, and one of you are about to be shot to hell. Someone could jump in front of the arrows and soak them up with a defensive skill, or maybe sacrifice their own health if they have no other option.
It's just going to be filled with awesome moments!