(Edit: I admit that it's pointless to give everyone's hypothesis on why VF5 is not popular...
Maybe this thread can be recycled into a VF5 meeting place?
Maybe it will encourage some people to try it again. ...Or buy it.
My xbox name is Subatomjx, so add me if you want to pound on someone clueless in VF5.)
I get the impression that it's what matters is the easiest bullshit to use. Not how easy it is to avoid said bullshit.
Cervantes stun spam is popular because it's strong and easy to perform. Bind A+B somewhere and monkeyslap the controller for a while. Scrubs can't do anything against that except do it too and have fun doing something so simple.
Mitsurugi only needs a few moves with easy inputs to keep going for a while. No need for defense... And scrubs can't do anything against that. Same as above, they start doing it, and enjoy doing something so simple.
So if you want to win, the answer is very simple and easy to reach.
I doubt that it's because of throws being hard to break. (Although I DO feel cheap being an Aoi command-throw and ground throw whore...)
There's the execution speed. In SCIV you can take a break, take a kit-kat between each attack input.
In VF5, button mashing is easy. But playing consciously and carefully at THAT speed? I'm sure that many, many people can't do it.
And ...so far I haven't seen much potential bullshit, but I only had the game for two days...
The worst I've seen was some guy that kept pounding me with small punches. I wasn't able to block punish at all. But that's not the most entertaining kind of bullshit and it requires a minimum of creativity.
So it probably doesn't attract many scrubs.