A question on the ret pally stat priority PVE
The "generally accepted" method of breaking haste-stacking at 40% is dependent entirely on having 4pT16, which bloats our ST rotation by adding DS into the mix. I was on the fence about this for a very long time, but as I've recently acquired 4pT16, I feel it is a valid approximation; I, personally, have seen abyssmally few procs out of the stupid set bonus, but I'm still keeping my haste around the 40% mark as a precautionary measure. Going to 50%, however, is still a valid method, since the 4pT16 has such a relatively terrible proc chance to begin with.
After that, it depends largely on whether or not you have Thok's trink. With the ridiculously inflated item levels we've been reaching of late, mastery's been pulling farther ahead of crit than it was this time last year, and mastery is also a solid and reliable stat. However, if you have Thok's, crit's value comes back up to, at the very least, match mastery's value - depending on the rest of your gear, crit may in fact exceed mastery.
I, personally, am leaning more towards crit for now (well, once I get Thok's, anyway >_<) because crit benefits all our damage, while mastery benefits a small amount of our offensive abilities - but, yes, mastery does still account for a very large portion of our total damage output. Since HoL procs are entirely dependent upon the initial hit, though, more crit means bigger base hits for even bigger mastery procs. Crit is also the only secondary stat to directly impact our L90 talents, and the damage of our legendary items (though haste does affect the RPPM of the cloak and meta!).
So, really what you need to do, is get Thok's Tail and 4pT16, play around with it all, and decide what you're most comfortable with.
I'm running Simcraft after each major upgrade and at 552 item level Haste seems to be just a tiny little bit ahead of Crit and Mastery. And those give me headache because if I reforge one into another (if can't into haste), the other goes ahead in weight. But I still prefer mastery, because it is constant buff to damage.
Although I was unlucky to get SoO trinkets, so my ilvl can be taken with grain of salt.
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