Check out this interesting article from iPlaywinner.
This article, though at times wordy and bombastic, really hits on something I've experienced myself. The author details the nigh-indescribable feeling of playing MvC3. He contrasts that with the experience of SSF4. It is hard to put into words how atrocious it feels to play SSF4 shortly after playing MvC3. MvC3 feels so creative and interesting that everything looks bland in comparison. Will SSF4 be kicked to the curb faster than Mubarak? You'll find out firsthand in a mere 18 days.