Hi,
I've read on noxxic that Crit > Haste > Mastery for Unh pvp.
On the other hand there is some guide on US forums that states that it is Mastery > Haste > Crit (http://us.battle.net/wow/en/forum/topic/8087088637)
Which is that than ? To be honest I don't know why would crit be so high ? I mean mastery is pure damage and haste just makes everything "quicker" ?