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ShinkuDragon Why is the GIF image reversed?
Anyways, I prefer Fury to Buster as a DrK as Fury handles more than 3 mobs in front of you better than Buster IMO.
About Dragon Roar, It's much more useful than I thought it was upon using it. Considering that there are training spots that I mainly use Shout on my Hero (Mr. Allis, Captains, etc.) Dragon Roar will have good use there. Dragon Roar isn't as spammable as Shout is considering that it has a cooldown, but it's meant to weaken mobs to help you train faster.
Speaking of map layouts that favor AoE skills such as Shout and Dragon Roar, Mr. Allis have the familiar that actually heals 15% of your HP and MP every 10 seconds which will compensate the HP consumption on Dragon Roar that is level 15 and above. I would probably consider maxing Dragon Roar as you don't need to worry about wasting HP potions if you have a Familiar with you.