Trapping mobs on pull was pretty easy, just arcane shot after tank pulled, or run up to the mob and trap them. Could also just pull yourself, then feign death once something was trapped.
You also didn't need to sheep pull, was easy enough to precast sheep so it'd hit after tank pulled. Mage could also easily fireblast to pull something out of the group, then frost nova it to sheep it easily in another spot.
The fun part is when you had to try to CC as a warlock, trying to control where the fucking mob you feared would go so it wouldn't aggro more shit. On the plus side you could double CC with fear+succubus sleep, so that was pretty good, and you could rotate fears between 2 mobs to make them run back and forth. Priest Mind control was also great for "CC", could MC the cool mobs with fun abilities and shit.