SF4 is to OG SF what MvC3 is to OG VS series.
The difference is you, to my knowledge, aren't that big on traditional SF to begin with. Whereas people who were, are more inclined to look past the flaws of SF4 and see familiarites with the type of play they used to enjoy.
Now, seeing as you grew up a fan of VS games, you're more likely to do the same thing with MvC3.
Truthfully, neither game is perfect, but, they both deliver what the people that play them want, just with a side of added stupid bullshit.