http://www.wowarmory.com/character-sheet.xml?r=Gnomeregan&n=Stripf%C3%B2rgold
Here is my toon, just to use for examples to help me understand.
So basically, the way I understand it is this: Add up the chances to miss, dodge, parry, and block, and if it = 100%, you're block capped? So...
5.96% chance of being missed.
18.48% chance to dodge.
16.12% chance to parry
20.72% chance to block
=
61.28%
Add 30% from ability.
91.28% chance to block, parry, dodge, or be missed. Right?
Also, I had an extended discussion with a guildie who told me that block rating and value are both crap in WoTLK because the -1000 or so health isn't a big deal when facing bosses like patchwerk or really almost all bosses while raiding, while I thought they were great stats to stack for pally tanks.
Anyone have any light to shed on the subject?