Hit rating is only decent for burst threat. You shouldn't worry about it whatsoever. You should never gem for it and shouldn't worry about it on your gear unless you are building a threat set and it's hit or expertise. Any fight that requires you to taunt consistently is a fight with no adds so it's safe to use RD and Hand of Righteousness so you have two taunts and the odds of both missing even without any hit rating is minimal.
