I think Ultimate Moon Knight's split-personalities are AWESOME! It creates the perfect metaphor for the classic story of someone joining the bad guys in order to bring them down from with-in: and the classic struggle of not losing yourself while you do it.
Sure, the ROnin concept isn't obviously being done any justice here, but if we look at the concept in a very shallow fahsion, almost as a Bendis inside joke of "Any random hero who needs an alias hero persona in my books will be called 'Ronin'" I appreciate the humor.