What is Dark knight for now that War just does everything better?

[GoatOfWar]

The more i play, the more annoyed i get by this nagging sense that i'm playing worse Warrior. They outperform us in just about everything except for soaking magic tank busters, which we're not even that much better at. Besides that, they have the highest damage, shortest cooldown invuln in the game, best sustain of all tanks, better raid utility. It also does not rely on a 2 minute burst so isn't punished as hard when fights end before their burst.
I plan to get into savage next week, but i'm becoming increasingly frustrated with Warrior's state. And feel like i'm just playing worse warrior for no fucking reason.
So what is the point of Dark knight's existence currently? 'Play it because you wan to play it' will be ignored. You could play conjurer or Arcanist at level cap because you want to. That doesn't mean that you should.