Originally Posted by
Marok
After many, many hours of running sims and evaluating the actual defensive benefits of each secondary, I've finally come up with a stat priority for Protection. It is:
Versatility > Mastery > Haste > Crit
Now I know what a lot of you are thinking: "How did haste go from being the best to being 2nd worst?" The thing is, haste was never the "best". It was never proven with simulations or math (at least in the places I look) that haste is our best stat defensively. The whole "haste is best" rumor started all the way back during Legion alpha; everyone saw that Shield Block, Shield Slam, and Revenge scaled with haste, so everyone just assumed (including myself) that it was our best stat. That rumor was passed around, and now it's in all of the guides. The main problem with figuring out a stat priority for Prot was that there were no working simulations for the spec until somewhat recently. You also can't exactly base a stat priority off off napkin math as there are just too many variables to consider. So while it's a bit late, we have a real stat priority now.
So why is the stat priority above correct? It comes down to our two main forms of AM, Shield Block and Ignore Pain, and how each stat actually affects those (and by extension affects our survivability).
One thing people need to realize is that Shield Block is no longer our "main" defensive ability. Ignore Pain provides the majority of survivability. So stats that increase our already powerful Ignore Pain are going to be strong.
Note: If it seems like what I'm saying below is anecdotal or "guess-work", I assure you it's not. There are just way too many sims to link here that shows everything I'm saying.
Versatility
The main reason Versatility is our best stat is the fact that it "double-dips". It provides a % increase to our IP's absorb, and it provides passive DR. In fact, if it didn't provide that DR, Mastery would be our best stat, as it actually increases IP's absorb more than Versatility does (in addition to the bonuses to block/crit-block).
Mastery vs. Haste
Compared to haste, Mastery just does everything better (besides DPS). Even though haste provides more rage (and therefore more IP casts), in terms of total IP absorb, Mastery wins out because of the extra Attack Power it gives you.
To give an example: In my tests, running haste over Mastery only provided about an 8% rage generation increase. That only got me about 8 more Ignore Pain casts.
Another thing we have to look at is blocking. This is the main reason people thought haste was so good, because it provided high Shield Block uptime. So while haste increases your Shield Block uptime, it's actually worse than Mastery in terms of total damage blocked. At 0% haste (with HR), our Shield Block uptime is already quite high at around 71%. Depending on the fight, that's already enough for a very high effective uptime.
Crit
Because they increased the diminishing returns on parry so significantly, Crit is just not a good stat for survivability anymore.
I figured I might as well find out what our DPS stat priority is while I was as it, so here it is (it's pretty much what you'd expect):
Haste > Crit > Mastery > Versatility