I levelled drg a little while ago just to level it, I really enjoyed the class and although I know I need a lot more practice at the class to be considered good.

I never really found it hard to pick up the buff on initial pull from tank, and usually the enemy would die as the buff wears off so as I position for the next one I would automatically re-apply the buff regardless of how much time was left unless of course I was mid combo.

that being said there is certain times that its not necessary to pick it up as the enemies will die within seconds on aoe spam or just sheer focused attack from the group.