I disagree with alot of what has been said in this thread. I run with full mastery, only gemming mastery/stam etc. for socket bonus. As a warrior tank I take basically the least damage in my guild as a tank however it is very close between me and our geared druid. I do agree with agg as usual expertise and hit are not needed. It has literally been said over and over in many threads on these forums and others that reforging or gemming for these threat stats are not worth it unless you need the extra dps/threat for a specific fight. The fact that people still keep coming here saying "your supposed to cap expertise right?" is getting at least a bit frustrating. Especially when other tanks then agree with them.
If a healer likes a tank with a big health pool I am sorry but this sounds like you just like the health pool so you can slack and have longer to respond to situations. Mastery does result in much less damage taken and much less spike damage. It allows healers to avoid going oom and allows them to use their more mana efficient spells rather than have to bomb holy lights etc. all fight. My guild currently has several hard modes down and with the massive amount of damage you take on some of these fights I know there is no way I would live with pure stamina. Our healers are already damn near oom. To say that Hard modes are going to favor stamina is silly especially since all the warriors in the end game guilds that are doing this content are doing basically the opposite. If you haven't done research, looked up what others are doing etc. don't just assume you know how things will go in harder content.
On top of this I want to remind everyone why EH was important, EH allowed you to live through spike damage, fights where you could take massive amounts of damage and would often be the situation where tanks would die. EH allowed you to survive these situations, the health pool allowed you to sit there survive the huge chain of spike damage and then get healed up. This is not the case atm, I was an EH supporter but the current content just doesn't agree with it. You very rarely take huge spike damage anymore than will kill you unless your doing something wrong. In general it is just a steady stream of damage, the lower this damage is the easier to heal. The massive health pool is unneeded to survive this damage, the mitigation and avoidance that dodge/parry/ and block give you lower this amount of damage (don't forget about armor). The way I see it is that EH has just had it's priorities changed, the objective of course is still to "survive" the fight. EH does this best, but if your healers go oom and your health is never approaching 20/30% until they do so that health is just a waste. Unless it is acting as necessary cushioning like it did in ToGc and ICC to keep you alive it is wasted stats. Healer mana and the amount their spells heal for are very important atm and thus we must cater to those needs atm. At a future date perhaps in another tier or 2 when healers have no mana issues (if this ever happens again) EH will return to it's proper place I am sure but as it stands stamina is no longer king.
Feel free to agree or disagree with me but that is my 2 cents.
edit: Taunts can no longer miss either in regards to the original post.
He who is afraid to lose will never win.
Only when the power of love overcomes the worlds love of power, will mankind know peace.