I think I've read somewhere that they are the best tank in high-end enviroment due to that they scale better than the other classes, maybe equaled by paladins but not sure.
Also you didn't reply to my first post so I'll make a tl:dr version here
Expertise dont have a static value
It have close to twice the value of hit when below the dogde cap
It have ~ equal to hit when above the dogde cap
taunt is running of the spellhit table make sure you inform that
So taunt need 18%hit 10% with your glyph 7% with a boonkin/sp in the raid 6% if there is also a draenie present
Alot of high end tanks(to my experience)
skip! the taunt glyph because it's really not that needed
Anyways hope you care to reply this time around
