Originally Posted by
Krisan Thyme
None of those characters you refer to as "cheap" were very easy to play. Juggling with Magneto took skill, it wasn't something just anyone could pull off. Furthermore it wasn't the juggling that led to his popularity, it was his speed. (He and Storm were two of the fastest characters on the roster.. They're also incredibly iconic Marvel characters, which is why they made a return.)
Jin also only had one game to my knowledge, he's a very unknown character. Arthur on the other hand has been in a number of games.. Furthermore, people have been wanting Arthur as playable for years now. (He was one of the most requested characters, so no.. He's not so unknown as you might think.) Likewise, MvC isn't anywhere NEAR as popular in Japan as it is over in the West. (So Jin being better known over there doesn't apply either, because MvC3 was specifically catered toward a Western audience.) Felicia is also the second most well known character in the Darkstalker series, and has made cameos in many other games..
And honestly.. If you think Roll was better than anyone on the MvC2 roster, you obviously never played the game competitively at all.