I am down with the idea of making Dark Arts a free crit/dcrit since people seem to think TBN's amazing mitigation (considering how short of a cooldown it's on) isn't enough of a reward as it is.

Just, please, don't repeatedly stand in 100k+ damage aoes just for the sake of activating TBN. I've had a couple DRKs like this, and they're only slightly less irritating than the BLMs that will never move out of their Ley Lines no matter what.