Remember, Curse of Exhaustion is basically 4 times better now than it was before 4.0.1. Its duration is 30 seconds now over 13 or whatever it used to be, and it's a 50% snare instead of a 30% snare. I think its range is improved too.
Just CoX > BoA > Corruption and watch droves of mobs reenact the Baywatch intro in a most gory and unpleasant way.