This has been explained several times before. VF5 cannot be played on-line with seriously compromising gameplay. VF5 has the most precise timing of any 3D fighting game. The loss a mere frame can throw the game off. Unless everyone suddenly has internet connections that ping at 15, VF5 cannot be played on-line. This horse has been dead for months, so would you please stop beating it. KruzeS went into great detail about why VF5 isn't currently possible on line. Read his response to this thread
http://www.vgchartz.com/forum/thread.php?id=3390








