I would think that X-Men would be the easiest super hero game to crack but we still havent had a superb X-Men tittle. X-Men Legends series was ok. They didnt really do well in emphasizing the various mutants. There was a semi class system involved and mutants were just put into groups. SNES games by CAPCOM were fun, but they were just typical beat em ups.
What should the developer prioritize in a X-Men game? X-Men is not about a singular character. People will be expecting a big cast, but at the same time that will more than likely dilute every character vs just a few memebers
What genre?
Who should develop it? Platinum games developed X-Men would be a cool assuming the effort is there. How about CAPCOM? They have a good history with X-Men
What do you want from an X-Men game?