A few questions for you to ponder...
Aren't any of you going to play the single-player game at all before you try MP?
I didn't get into JK early enough, but was it big the first day of release?
Oh, and will there be a lot of laggers around? I imagine the system requirements will be quite a bit higher than JK, and most people that play will probably have a higher-end machine, so i doubt there will be as many.