Все, что смог найти, это старая страничка с гайда по воину танку с сайта elitistjerks:
Increasing your hit rating increases your chance for taunt and challenging shout to land on a target. It is currently believed that 1% hit (15.8 hit rating) raises your success rate with taunt by 1%.
With 0% hit rating, the taunt resist rate will be 17%. By adding hit rating, you lower the chance for a taunt to resist. You cannot lower your chance to resist a taunt below 1%, making the effective "taunt hit cap" 16% hit, much like spells.





