In Wrath, Prot got defense (soft)capped, then went Stam after possibly becoming uncritable/"unhitable". In Cata, we were told that we needed (or, at least, could use) a more balanced or even avoidance leaning approach.
That is, that the nerfed healing meant that avoidance would/could be more valuable as it would save on your healer's need of mana and so you could fight for longer (which, as a tank, is always a good thing, right?)
However, I saw Xayton and some others speaking against a guy who was talking about more mitigation in a thread (I believe the operative phrase was something like, "You can't block dragon's breath.")
But I don't remember seeing this addressed in detail in Xaytons' tanking guide, though it's possible I missed it.
Is Cata just like Wrath in the sense of Stamina stacking being the thing to do? Did any of the changes make some mitigation stats more useful than before?
IF mitigation worked, I could see it being useful in Cata's less healer-friendly environment (where your healer's mana bar may become the new boss enrage timer.) But if not, I could see Stamina stacking maintaining it's dominance (health "blocks" everything, whereas most[all?] mitigation stats are limited to physical [or magic, in the case of Resistance, not that you'd have a plate wearer typically dealing with that sort of thing...])
But I haven't seen any real discussion on this in the stuff I've been reading here. I'm also somewhat new to the Prot thing as a main spec, so I'm curious how this is boiling down so far in Cata.
Is mitigation still mostly worthless, or does it have value beyond being "unhitable"?