Dark Changes are good, there need to be more of them. Delirium is not enough of a change on its own.

Dark passenger needs higher potency and less mana to be useful
raise bloodspiller so TBN is really dps neutral.
Lower dark arts costs by 400 mana to 2000 per cast

Then dark knight will be above/near paladin. Anything less and dark is dead for another raid.

I'm very surprised that warrior has seen so many heavy handed adjustments, I think this is the third or fourth overhual of skills in one expansion. Mean while Darks are still trying to get dark passenger to be worth while on a single target for the past 7 months.