Ok, so i see it this way, if your doing AK and grabbing multiple packs and AOEing (fastest way) then your clearly WAY OVER GEARED for AK, as are your DPS so it does not matter (plus i'm sure anyone this overgeeared has done AK SOOOOO many times they know the kill order).

Now, as a bard, one of the better AOE classes, I can say that AOE isn't that great unless you have multiple packs, and if I am not 100% AOEing and use any damage coldowns, I will be tanking if I am not attacking the tanks primary target (or have yet to meet a tank this isn't true for, some do alot better than others, but i tank most trash unless some marking is done)

Now I refused to mark as I leveled WAR because I didnt see the issue with needing to mark, it wasn't till i leveled my BRD that I realized the importance of marking at least the first target since the rest of the pt do not get the agro lst till they actually attack the other mobs.

Its not like its hard to add a mark1 macro with tomahawk/shield lob so that the skill you use to pull with is making the first target, and by the time that one dies as a tank it shouldn't matter what the DPS select as their next target if your good at your job.