I agree with Lyonheart.

I was able to pull 2 packs (5-6 mobs) and AOE them at level 48. It gets easier after level 48, but you have to still watch out for the shadowhunters that can cast hex on you. Dont pull too many of those fellows otherwise it may end in a wipe.
Also remember to get AE upgrade at level 46, it helps a lot!