Ultradavid said SFIV is one of his favorite fighting games. I take what he says or any top player with a grain of salt.
It has its issues, but SFIV and SFXT had more issues than CVS2. CVS2's biggest problem is that its not a very good game for tournament organizers to plan around.
CVS2's variety, and totally fan service would be generally well accepted, and it doesn't have the same lack of cohesion as SFXT. All it's mechanics are fully realized while a bit unbalanced.
The poor balance, roll cancelling, and some other stuff would cause rage/rejection if not patched.
A modern CvS2 would end up playing very different than the Dark Ages version.