On our new Wii, we have only played Wii Sports so far, and no boxing because we have only one nunchuk. On the tennis court, she serves much better, and I have a good net game. She bowls more strikes, but I can pick up difficult spares. We need other couples to play against, so that we can team up. We bowl better without pants. That could be an issue.
We need to get an MMO going together sometime. She likes hitting things with swords, and I like support. I hear that it is always easy to find some damage dealers once you have your tank and healer.