I am totally confused on this... Our best stat outside of Stamina is Mastery. Why do we have a block chance % and then Mastery that says "increases your chance to block melee attacks by %?"
I am 47.95 % Block chance and my Mastery is 19.09% = 42%. I am in all blues finally after getting a basic dps bracer with mastery/hit on them so in theory could be used for tanking. I feel that I am in pretty good standing with my stats in ilvl 344 gear sitting at 140k HP unbuffed. At about what time would be viable to start doing the raids tanking?

