Well, it's already live and players are playing and enjoying it, so I guess it depends on what your criteria are for "working".

There's a fair number of farming missions (missions made just for XP gain) and people are trying to game the ratings system to exploit ranking, but on a more localized scale there are a good number of player developed missions, MA communities for finding these missions (like the coh_ma community on LiveJournal, or the forums) and honestly, some people (like myself) are just making mission archs for themselves and their friends to enjoy, sort of with a "put yourself into the story" agenda, to feel more involved with the canon of CoH. A fair number of players are making missions to explore the backstories to their characters, which is pretty awesome.