From 1.5 patch notes;
"Weakness to Elements: This ability will no longer agro monsters. Using this ability on a target that is already affected now properly refreshes the duration instead of removing it. This ability also now has a graphical effect."
Didn't happen. They still aggro the moment you press the button and eventhough fired at max range, they're half way to the caster by the time the animation is over, makes it impossible to cast any "Elemental" before the monster/mob is right up your face at melee-range. It seems that by casting this ablility your opponents also gets increased speed.
This skill has been broken since 1.4 ...