The one thing we notice no one mentioning is the bonus of the taunt effect on vigilance. We will give an example 2 specific example where we find this useful. Heroic Hall of Stones escort quest in game. Mobs come faster then every 6 sec so TC is down, and since you never leave combat your healer will tend to grab agro of the new mobs because of the hots or a heal the moment they run into range.
We get 10% threat of that heal he casted and we can taunt 1 mob right off the bat, mocking blow the other mob, and once the 3rd one hits the healer taunts back up and we can retaunt again, now having all 3 mobs on us and save TC for the next wave coming in. The golems randomly target and you can not hold threat for to long. Throw vigilance on the healer any time one of the golems hits the healer taunt, sure you can not hold agro but you can keep it from constantly attacking your healer. We provide Dungeon Fighter gold for you.
For 1 point we really think its worth losing 2% crit. We do not see it as additional threat so we do not lose agro we see it more of a keep the squishy alive ability. We have not done naxx or anything more then heroics, if we find that in raids there are not many encounters where mass amount of mobs pour through doors or mobs will randomly drop agro and target others then we most likely will respec back to 4 points in cruelty.
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