I've recently been getting into playing a Shadow Priest and currently been going on the PTR to test the waters.
One thing that is riddling me is the stat priority. Haste > Crit > Mastery
From changing around the gems and testing multiple ways of doing dps I've come to start doing Mastery > Haste > Crit as the priority and can't seem to understand why other would go the other way.
Between the 2 ways of going for stats the difference in stats are roughly:
4% Crit
4% Haste
and....18% Mastery.
At first, I thought maybe the haste was for a haste threshold for an extra dot tick. Which did not seem to be the case since 24% haste is the next dot tick for 2 of the dots. Then after more research I found that it's so you can spam heals just a small bit quicker....doesn't really impress me. And then with the crit I've heard it's prioritized for the chance at small random burst of damage on Mind Blast. To that I must ask why give up 18% Mastery for 4% of the other 2? I realize mastery is only offensive stat with no defensive value (Doesn't effect heals) but it gets you to near 40% chance for VT, SWP, DP, AND Mindflay to proc double damage, which includes crits in that number even. Even Insanity Flays can proc the double damage. Give me a mastery buff and it jumps to near 50% chance for this to happen.
Anyways, I just wanted to hear everyones opinions on the matter. Perhaps, I can be given further insight as to why that 4% haste and crit is so important.