Corpse Tongue Coin
One of the biggest things that people forget to consider when they start to evaluate armor vs avoidance is that armor gets better the more you have and avoidance gets worse. Diminishing returns on avoidance makes the itemization budget an inefficient use beyond what comes on the basic slots.
Additionally, it seems that most who start to look favorably at avoidance trinkets don't get what really happens with statistics like these. 10% does NOT mean you will avoid 1 out of ten hits. It means over the course of thousands of itterations, it will average out to one in ten. Every time you flip a coin, it is a 50% chance of heads no matter how many times you had heads in a row. Every time you are swung at, you only have a 8% (or 4% increased) chance to dodge. That is really small and a good tank doesn't want to rely on that. Over such a small itteration as a 5-10 minute fight, the odds of a string of three hits in a row are MUCH higher than three dodges in a row even fully stacking avoidance.
As far as that goes, I haven't tried the numbers myself although I know there are great threads on this site about it. I would not find it unusual that even with avoidance trinkets, the odd of ten hits in a row are higher than two avoids in a row in ICC.
"he doens't need healing, he doesn't need healing, he doesn't nee-WHAOSHIT!wtf was that man!". Please stop leaning on TDR. -Teng