Not every piece of gear in the game has to be for you. Yes this is a VERY nice ring but if you're a pure melee whining about the lack of regular regen take a sec to compare the availability of reg. regen items to mana regen. Then cancel out all of the mana regen items that are for casters, then disregard the raid items. Take that all into consideration and congratulate your hybrid friends on a nice item.
(Btw, casters need regualr regen also, lets not forget necro's and DoT's on a raid hurt everyone)