Yeah I plan on getting VF5 because I like the series, but I'm getting it for the SP side of things. Online play in fighters sounds so good in theory... but I haven't seen it really work out well in practice yet. Way too much lag in the average connection still.
Maybe they'll prove me wrong.
It'd be neat if it were some sort of "fight an AI approximation of your opponent" so you could download the top of the leaderboard and learn how to best them. Otherwise, I'll probably only play a few times online.