So i have just recently reached Level 90 with my hunter and im still gearing up,i have 472 ilvl but im still missing 2 pieces from Heroic dungeons and a few justice upgrades.
I searched the web for some guides and i found diferent stat prioritys for Bm,currently im running with Hit/exp cap>crit>haste>mastery but on some guides i saw Hit/exp cap>mastery>crit>haste or Hit/exp cap>crit>mastery>haste..
I would really apreciate if someone could answer my question,here is my armory if anyone needs to see it:
The thing to know about haste is that it affects your rotation: you have 5 seconds between kill commands, so if you have a 2-sec cobra shot cast time you can do 1 CS and 3 instants or 2CS and 1 instant. If it's 1.8 seconds, the you won't fire more shots (just a small gain to regen and auto-attacks). But if you go down to 1.5, for example, you'd be able to fire 2 CS and 2 instants.
Then in BM there's Focus fire, and rapid fire, and heroism... So haste is something you decide to cap at a certain level - like 1.66 sec, 1.5, etc to change your rotation.
So one technique is to hit a certain cap (depending on your gameplay) for haste, another is to reforge it into crit or mastery.
I personally go for crit then mastery, but both are nearly the same - putting everything in one or the other would be like 500 dps on 90K for me.