Street Fighter IV is one of the more balanced fighting games out there. If you're mashing buttons, you're doing it wrong. But hey, if beating your little brother by hammering buttons is boring, I can't blame you
I won't defend MvC2 as balanced, but only "That Guy" gives a fuck. The rest of the world is having fun beating each other up and don't have time to memorize which of the 50+ characters are the best.