IV is just as “fluid” as any previous SF title. All of your eyes deceive the shit out of you, since there’s an auto bias in your brains on how fast the gameplay is based on the look of the game.
I.e. When you see 3D models, you automatically view them as slower than that of the same animations seen in 2D form.
EX was viewed the same way, but various people (here) proved EX’s movements were pretty much identical, if not faster in most cases.
Stop the fucking madness.
EDIT: If the game is any “slower” than one of your personal SF entries (because you know, the game has to be faster than Marvel vs Capcom 2 lulz), it’s because Ono wanted it like that. It has nothing in any way to do with the visual choice (3D graphics) chosen for the game. TvC, a fucking fast 2D playing, but 3D modeled game is a prime example of this, and guess what, same company behind both.
So seriously, stop the madness.