Its a good thing you both had fun, since ultimately this is what gaming should be about, a fact often overlooked on some of the newer games for the current batch of next-gen consoles - fancy graphics but rather unrewarding gameplay.
The great thing I find about Neo Geo is that the vast majority of games enable for 2 players simultaneously - sports games, fighters (be it vs or cooperative mode), shooters etc. and that the games themselves offer instant pick-up-and-play appeal - no need to first study a big instruction manual or play through for 1-2h of basic training where you are first learning the controls before the real action unfolds.