I'll agree something must be done with this. It is actually in a way more powerful than cyclone slash/sweeping slash because it has a 360 damage area, not just 120. It also has no limit on number of enemies it can hit.
But sin being one of the class that is constantly force starved, the thing is mostly not worth it.
For tanking, it would need either a lower force cost with a cooldown of 6-9 sec and more damage in my opinion.
Its not game breaking, but seeing the ability made useful would be nice.
Go run a lowbie flashpoint and or somewhere and pull a bunch of mobs, you will see it has a 5 limit on the number of enemy it hits.