The idea of a block set being better is that the lower damage incoming allows block value to catch up..
E.g. 3k hits after armour and talents:
BV set has roughly 2k BV, Avoidance/ EH set has 1k BV.
BV set has 50% avoidance, Avoidance set has 60%.
In 100 hits, the BV set will take on average 50 hits of 1k each.. the avoidance set would take 40 hits of 2k each.
Which would make the BV set better at mitigating the damage.
The bigger the hits after armour and talents are, the worse BV scales in relation to them as it's a static reduction.
An avoidance geared tank on loatheb will take more damage than a tank stacking BV.
And with the whole BV is static thing, this means that the harder bosses hit, the worse BV is as mitigation.. 2k off of 3k is a huge amount, but 2k off of 30k is almost insignificant.
Replying to the guy who has a dk with 40k unbuffed, I'm guess he is a mongrel spec DK that went for all of the stam talents in his build, but if he isn't.. fair play to him. I was actually referring to paladins in my post though, not DKs, but this just intensifies the problem even further to be honest..
45k HP DKs and 50-55k hp druids.. the bosses are going to have to hit mighty hard. or it will just be a druid tank meatshield deal for every fight.
Having thought about it, even with the nerfs to DKs, just with the nature of how druids tank, high armour, high HP and soak up the damage, its hard to think of any scenario where they wouldnt shine.
The main problem lies within the fact that a fast hitting, low damage boss wouldn't need much healing, making the encounter trivial, unless there were some sort of weird and wonderful mechanic involved.. and then the focus isnt on the tank doing a good job, is it?
Does anyone go into the loatheb fight when and say "GJ" to a tank for not dying at the end?
The essence of tanking is having a character than makes the seemingly impossible, possible.. unfortunately shield tanks are painted into a corner, and changing block and slightly nerfing dodge wont nearly be enough to fix it.
I'm not gonna toss around the word overhaul, because it would be ridiculous to do so mid-expansion, but for shields to be even remotely effective they need somethign big that isn't too much of RNG.. I was thinking fo soemthign like a chance on block to increase your block value for that hit by the armour value of the shield, but this would lead to spikey damage.. the only other option is to have it cooldown based, perhaps this could be a change to holy shield and shield block?