Seriously, you have to realize that Different does not equal Good. Just because Jazz music in a fast paced fighting game is different doesn't mean it's a good idea. Maybe the reason no one tried it before was because everyone realized it was a bad idea.
How about we make a Sonic game with Beethoven? How about a Mario game with Black Sabbath? A God of War with music from Lazy Town?
Two Goods together do not always make an awesome. (Although I would like to see God of War w/ a Lazy Town soundtrack.)
MVC1's soundtrack had some nice midi tunes in it. They are what you'd expect from a superhero game.
Yes, I do expect this type of music in a superhero game. If you are going to pull a switcheroo, it damn well better be with something equal to or greater than the previous. MvC2 was a case of biting into a Custard-Filled Donut to find the custard replaced with tooth-paste.
We adults love all kinds of music. You youngsters will most likely grow to appreciate good music someday as well
You can appreciate all types of music and still realize some music just doesn't go with certain games. How about blasting that MvC2 music next time you play Doom on mute?