Byzah
(Formerly Mari)
As it's 100% instanced, I don't see the issue with AoE hitting the party too. After all, there's so many other ways a griefer can blow the mission (such as training, or if he's a key member, simply quitting). However, AoE that hits everyone can be become all but useless in a fast-paced game where mobs only stand still in one place if they're whacking on a party member. You get your alpha strike (if you can somehow survive the aggro) and then you have to switch to DD.