From what I've seen Archers draw ALOT of aggro. Did Tam Tara last night and the Archer we had kept pulling aggro away from tank. They should fix that.
As a level 50 tank I haven't noticed much difference between an archer or another high dps class aggro wise. All of them can get a lot of hate but with the proper rotations, you have every tool you may need.
Healer aggro on the other hand is something they might have to take a look into.