For soa, we had very little problems with the orbs. Didn't down him (lacking the dps to burn him in final phase) but the key to the orbs is to have whoever they are tracking needs to run into them and explode them. It does about 6-8k damage, but with a bubble the damage is negligible and the balls go away instantly.
Ya we are having our tank and our assassin dps taunt the orbs and pop cooldowns to take the hits and randomly people will pop defensive cooldowns and soak some orbs. Problem is when someone gets thrown in the air and they have a orb on them the orb dissapears and pwns someone after that while it's invis. So i'd say that's a bug hence my post