Originally Posted by Maahk

Let's say you're getting hit for 4k each hit. It would take each block negating 1000 damage every hit to make up the same amount of mitigation that 25% dodge/parry provides. This works out to 40 blocked damage per % of block/parry.

If you start fighting mobs that hit for 5k each, all of a sudden it takes 1250 blocked damage to equal 25% dodge/parry's mitigation, which now works out to 50 blocked damage per % dodge/parry.
In short, dodge/parry scales better with incoming damage by mitigating more than block value's relatively static amount.

More importantly for me, dodged or parried attacks don't use up shield block charges.

For me (assuming you have at least 490 defense,) stamina>armor>dodge>parry (because of itemization costs,) but all are >>> block value.

I do, however, understand the lost rage and more threat from slams referenced by Darkmgl in the above post, but referring to the original post, I would never give up significant amounts of HP or armor to pick up significant amounts block value as a PVE tank.