It's not a bug as far as I know, they nerfed it intentionally, and there are patch notes to show that the nerf is classic.
There is some debate however that they might have gotten the values wrong and over nerfed evade, but it's really hard to prove how much agro evade is supposed to reduce. This nerf is also exacerbated by the recent nerf to clickies making it even harder for warriors to generate agro.
My advice is if you want to do good damage without pulling agro, play a monk.
__________________
Mr. Irrelevant
|