In essence, I am writing this to support the statement made by Aalryn with respect to avoidance scaling better with gear. The important thing to recognized is that you should be interested in the "Relative" damage reduction made by an increase in avoidance versus the absolute reduction. Below are some examples.
ex#1.
Let x1= base avoidance = 50% = 0.50
x2= new avoidance to compare against x1 = 60% = 0.60
y = relative reduction in damage (i.e. the damage that you and your healers see)
= 1 - [ (1 - x2) / (1 - x1) ] = 1 - (0.4/0.5) = 0.20 = 20%
i.e. the damage reduction seen in going from 50% avoidance to 60% avoidance is a "real feel" of 20%
ex#2
Let x1 = 50%
x2 = 52%
Therefore y = 1 - (0.48/0.50) = 0.04
or alternatively you will experience a net reduction of 4% damage in going from 50% to 52% avoidance.
ex#3
Let x1 = 67%
x2 = 69%
Therefore y = 1 - (0.31/0.33) = 0.061
i.e. in increasing your avoidance by 2% from 67% to 69%, you will experience 6.1% less total incoming damage.
So yes, avoidance does indeed scale well as your gear improves. And hence, the "tank point value" that you attribute to avoidance stats versus stamina stats will also vary as gear improves.
Hope this helps and makes sense as I'm a family doc and have been outside of the math world for several years now.




