I've signed into the one on Xgen...
And it's really, really great, but disconnect ssues seem to be big problems with a lot of the players. It's fairly annoying to have a 2 v. 2 match going on, when suddenly your partner times out and leaves you for dead.
The graphics, the sounds, the music, the gameplay, all are wonderful and satisfactory, but the disconnect issue is a big issue I have with the game, albeit the only one at that.
8/10 for a good game hindered with connection issues.... like Castle Crashers. :P