|A random picture of AoE from Google Images|
I've had dps and healers run ahead and pull packs back to me. It's really annoying, but the growing community consensus is that the tank should be getting as many packs as they can.
I think the major problem is that AoE is too good relative to single-target damage. AoE is generally better at 3 or more mobs, and that's the size of an average pack. So simply pulling two packs at a time is a complete win.
AoE also obsoletes tactics like Crowd Control. No point in sheeping something, it's going to get broken in the first few seconds. As well, tank AoE threat has to keep up to match DPS, and that in turn has made tanking very easy, and has removed a lot of the tank gameplay that Vanilla WoW or older MMO structures.
AoE should be significantly reduced in effectiveness, such that it only becomes viable at the 8-10 creature mark. Single-target gameplay should be the norm, except in situations which specifically call for AoE. Single-target trinity gameplay is far more interesting and fun than AoE gameplay, and so AoE damage should be kept under strict control.