And they have so many other games that don't have joke characters. In a game where you fight Dr. Doom, Venom, Wolverine, Sabertooth, did we really need Roll? Did a Servebot have to be playable? Or a giant Cactus, which was done from scratch instead of spending the time working on a character that people actually wanted.
I hope MvC3 does it like MKvDC, and chooses characters based on similarities, or where you can build decent rivalries around. Heck, they should just choose characters, whether popular or not, who wouldn't look out of place in a fighting game. They've got enough franchises.