Longshot

How did I read the ENTIRE article backwards. I have no explanation for how MvC2 did better. :)

I think the article is straight up wrong. I don't think it has anything to do with more work going into HDR, and everything to do with the fact that ST is a far, far, FAR more accessible game. ST is fighting at (nearly) its simplest. MvC2 is one of the most complex games ever made. That sort of intimidation usually factors very heavily against a fighting game.

Also, lots and lots more nostalgia for the Street Fighter Brand. Heck, SFIV has pretty much singlehandedly revived the genre for the masses.