If you notice.. Afflic is pretty much just fear-style CC. Your choice insta howl, fear, DC. Now add an aoe root into that mix (which is also a stun if they stay longer), ranged stun that can be used while you are silenced, stunned, sheep, fear etc (axe toss), you got your demon leap, another aoe stun.. which is just amazing defensivly or offensively, use before a howl etc... You really have 2x as much CC, plus the AOE is meant for crowded room fights, with felstorm, shadowflame, immo auro, helfire up you can overwhelm healers quickly.
Now lets talk about physical dps classes like rogues, warriors and ferals.. 600% armor +4k resil + 25% soul link (if you have a healer that is nice as well, but I never count on it).. there is your answer. The only thing it lacks imo is a nice fast casting bread and butter spell that hits for more than 6k.
Edited by Avayle on 10/2/2011 2:37 PM PDT