Hi, I just recently got an Xbox (for ESPN Football) and love 2d fighting games. I had heard about CvS:EO and how it's playable online. How well does it play? Lag issues or anything?
Not laggy in gameplay at all.
Only thing it's laggy in is that between rounds the voice communication goes mute for a bit (at the yellow load screen).
There's a reason behind this though: Marvel VS. Capcom was supposed to be the Xbox live launch title, and Marvel industries nixed it stating that they were only licensed to reproduce the game as it was; not make an online version. Capcom then threw together the SNK vs Capcom EO but apparently they hadn't had as much time to test, etc.
Either way, it is a good game if you like fighting games. It's a great used purchase if you're up for it.