As personal experience, its really NOT, wars get abused by super slugs. They only have one cooldown that can deal with the incoming damage and that's vengeance. Thrill of battle isn't going to do much. They are much better on raffle which does burst damage with swarm.

As for what my group paladin does is he grabs those adds by flashing them then circle of scorn then have the dps after acid rain head straight to raffle and burn it for a while. What he does then is does enmity combo on all of them and dps one of them down low enough to go super, when he makes it go super he tells the dps to switch targets and burn the super slug he dpsed down with the lb what ever it is and what ever is left just dps. THen he kills the remaining slugs. You have plenty of time to get aggro because those 10 stacks of acid only stack so fast and its a lot of time. Then he mops up the new slugs when they appear and kites them around and after that its a easy victory.