As a Dark Defender, I find twilight grasp to be a great pulling tool. I'm not sure why, but I can single pull tightly packed mobs with no problem.
Could it possibly be because it does no damage to the mob while drawing it's attention at the same time.
Take tonight for instance. Total team wipe on a mission. Healer takes a awaken tps me, rezes me. The mobs that wiped us are +2 Vazh (ugh!) and bunched at the top of the stairs. In order to use Howling Twilight I need at least 1 mob. So, I pile up the bodies with TP Friend and use Twilight Grasp to single pull. Drag him around the corner and pop HT and we proceed to single pull the rest at the top of the stairs, for an easy victory.
Twilight Grasp, It's not just for breakfast anymore.