Wii Sports is a very exceptional case in that the game doesn't asks you to react emotionally to it. The previous games in this feature pretty much expected you to emote when their respective scenes happened (Be sad for the Lumas in Galaxy, be scared at the sanity effects in Eternal Darkness). But Wii Sports doesn't asks you to emote nor to have a deep connection to it. It just wants you to play the games and have fun.
The emotion lies in how the game was so inviting that everyone could truly play it and have fun. This created a very unique social gaming experience in which you didn't exactly have to be the best player in order to interact with everyone else (which is the case in games like Super Smash Bros. Brawl). The Miis, as I explained in this review, also helped.
It's been said that the reason Zelda and Mario have been so successful is because in the first games the characters didn't have an expansive storyline. They were avatars for the players to control, but along the way they became an extension of the player, thus creating an emotional connection between the player and the game character. The Miis take this idea further by letting you create your own characters in YOUR likeness as well as the likeness of others. In this regards, Wii Sports creates a personal experience for many.
People often forget that happiness, pleasure and satisfaction are genuine emotions that may not be as strong as anger or sadness, but they are indeed human emotions. We as gamers often forget that games primarily existed to be enjoyed, to have fun with and for everyone to enjoy. This was a common feeling in the early days of gaming. I believe Wii Sports brings back that emotion of fun and happiness that was once seen in classic gaming. But rather than asking the players to have a very high level of skill to enjoy the game, it just wanted you to play, and thus everyone could have a great time regardless if this was their first time ever or they have been gaming since birth.
I know no one is going to see it this way since Wii Sports is the complete opposite of what developers want to create and what gamers have come to expect in games. On that note, I don't expect anyone to have any emotional connection since emotions are subjective. But I know that many people and gamers have great emotional experiences because of this game because of the things I just mentioned. It's an example of how gameplay CAN create emotional responses in people without having to jerk them around in order to get a reaction.