The thought process I go through as a Warrior is this:

- Do I have enough threat on the mobs to keep them all facing me?
- Do I have enough HP/Cooldowns to survive the damage while DPSing?
- Has my healer been able to deal with my shenanigans just fine so far?
- Can I survive a tank buster in DPS stance?

If the answer to all of those is yes, then I switch to Deliverance and bring the deeps.