It seems like some games are only good in the arcades. Play Galaga without a joystick and the magic is gone. Play Pac-Man with a controller and it seems much harder than it should be.
I recently got to play the real arcade version of Centipede (I had previously only played ports and emulations), and, I must say, I don't think I've ever had so much fun playing a video game! I actually broke a sweat whirling that trackball!
I've heard that Atari Football is fun because it revolves around whirling the trackball as fast as you can until you become physically exhausted. Some games just lose their magic when emulated/ported. Which ones come to mind for you?