So, I've been playing around with My friend Mr. Simcraft, and have thought a lot how to apply my findings to ToT Boss fights, and Im Now Convinced that the whole Haste >Mastery>Crit Priority we all follow is wrong. Here's what I think and why

Haste (to around 6000) > Crit >>>>Mastery

Most ToT boss fights have some sort of AoE or cleave component. Now due to the fact that we Have Shamanistic Rage In addition to Thunderstorm for mana, Maintaining Chain Lightning for Cleave is Trivial Now (One Shamaistic Rage during Cleave can give you back a LOT of mana since Chain Lightning is Free).

The Problem here is that Your Mastery Is completely worthless for Chain Lightning (the Chance is greatly reduced). Your Best Stat for Chain Lightning is Crit.....By a large margin in fact.

Here are the stat weights I get for 2 Targets with Light Movement for My profile (515 Ilevel)

Int 4.72

Crit 2.57

Haste 1.84

Mastery 1.28

As you can see, ANYTIME you Cleave, Crit is worth Twice what mastery is worth

Lets Add a Target and go to 3 targets

Int 6.87

Crit 4.59

Haste 3.48

Mastery 1.28

Crit and Haste Pull even FURTHER ahead of mastery on 3 targets, In fact its not even close at this point!

Now Lets go to a straight Patchwerk fight and compare.

Assume the following, Haste loses Value on a pure Patchwerk past 6050, this is due to Lava Burst Occasionally GCD locking. Its still not BAD by any means, but past 6050 Haste is worth as much as Much as the other 2 stats to the Point where there isnt really a difference. If you have 6000 Haste and Mastery or 9000 Haste and 3000 mastery, your dps is going to be within .1-.2% of each other.

So Anyway This is the DPS and stat priorites I get for the following Reforge

Haste to 6050 > Mastery > Crit

126377 DPS

Int 4.21

Crit 1.77

Haste 1.85

Mastery 1.85

Now this is a Patchwerk with a Priority of

Haste to 6050 > Crit > Mastery

125465 DPS

Int 4.23

Crit 1.84

Haste 1.85

Mastery 2.09

Theres Less than a 1% difference in reforging all your mastery into crit on a Patchwerk fight, Yet when you add a Target, crit becomes by far and away your best stat. So to me, the choice is easy, Since theres no real downside to stacking crit on a patchwerk fight, yet a Huge upside on AoE fights, Im stacking crit.

CAVEAT: I know that once people start sporting the 4 pc Mastery might yet get some more Value, I dont see it overtaking haste in cleave situations though. But The community seems to hate our 4 piece anyway, so maybe its not that big a difference.

Also, Our 2 piece Should scale with both Crit AND mastery, with haste being a constant, as long as our 2 piece can proc off of Mastery procs

Furthermore, I am Not sure what The Meta will do to this priority, I suspect not much except devalue haste, but well see when people start getting it

Feel free to discuss!