Theoretically, Kitru, since I'm not as good with math as you are, I pose a couple questions for a scenario that is likely unobtainable. =P

First question: What is the Base Crit chance for a Warrior at level 50?
2nd Question: How much % to Crit is each point worth in secondary stats?
3rd Question: At what point would your crit chance become so much more reliable, that it WOULD be worth using IB only as mitigation?

I did a Gear calcualtion and found that IF sacrificing ilvl, you can get to 553 Crit Rating. I don't know what your chance to crit is with that number, AND 10% from 5 Wrath Stacks.

But I would like to know how much +212 Crit Rating is actually going to give, and how beneficial it could theoretically be to Warrior DPS.

This scenario is totally Unrealistic, and impossible! So, Theory time. =P