I think Mickey Mouse would be a disadvantage to a game rather than an advantage. He is similar to Mario with his status in his respective field (as the mascot of Disney) however he simply doesn't have the status as a gaming character to carry his weight in a game.
Mario sells games because he symbolises quality, gaming and Nintendo - three things many gamers love.
Whereas Mickey Mouse games, well I think this speaks for itself.
http://www.gamerankings.com/itemrankings/itemsearch.asp
I believe that they can overcome this and turn Mickey into a great gaming character, much like I believe that Bioware can revive Sonic, however it would be securing yourself an asset rather than using that asset to gain popularity at this stage.








