Yeah...I suppose several years down the road, the PS2 & Xbox version will be slightly lesser offline versions, but in the meantime you kind of have to agree with bonestormer. I have a friend that was waiting for the game on the cube. Then he heard it wasn't coming followed by the fact that it was going to be late and not online, so he is getting it for the PS2. This here is practically a Nintendo loyalist, so most others probably made the decision earlier.
And a fighting game online seems sound, so it probably will be pretty fun. Hell, I can't wait until Nintendo deems online gaming profitable enough to take Smash Bros. online. Do I care that my copy of Smash Bros will eventually not work after several years? In a word, no.