I'm having the time of my life playing Super Mario Odyssey with my girlfriend. We're not playing together in the sense that we're using the actual two-player mode in the game (though, I hear that's fun too). Nah. We're playing it the way I got through most main series Mario games, before I could drive: we're passing the controller back and forth.
This is a companion discussion topic for the original entry at https://waypoint.vice.com/en_us/article/qv3jnd/controller-passing-co-op-is-the-ultimate-way-to-play-mario-odyssey