Why Shirk?

[Marxam]

Now Awareness isn't actually a proper cooldown, unless you know beforehand you'll be hit with a crit, and that only applies in certain fights.

Well awareness is almost mandatory for WAR since Raw Intuition crits from everywhere except the front where you get 100% parry. I haven't dabbled in Shirk yet as the cd is too long and provoke + enmity combo finisher still works the best. Though I can see it's use, as a war tank I really only have one more spot to fill and that's for a stun.