I hear you on the multiple different opinions. I have been wondering the same think, Elitistjerks say to stack stam, askmrobot, says its agility all the way and multiple guides say that we don't have to worry about hit and expertise. To me it seems that we have to work our butts off to hold onto multiple mobs and at times one or two if dps aren't targeting properly will pull aggro. I have read that our Thrash DoT is being mitigated by armor which is part of our AoE threat levels not being up to par, which does explain a lot.
I can tell you though the route I have taken is that of stacking agility and reforging the lesser stats to dodge, basically every piece we have will be reforged to dodge. I run with a paladin tank and they are always sounding shocked that I am not stacking Stam as you know stam used to be the be all end all stat that tanks wanted, which has now changed.
From what all I have read it seems that warriors and druids don't have to worry that much on hit and expertise cause we have passive skills that make up for it, and paladins and dk's need it. Does this make sense to me, not at the moment because I don't fully understand how the passive skill mechanics work. But again that is just an opinion and well my opinion is still wanting clarification on the same issue.