The most fun you can have fully clothed standing up
I've searched over and over again for a game that my family could play together where we all could play at our level and enjoy it. We have Mario Party 7 and while it's accessible for the kids, it's not exaclty a great time for my wife and I. Wii Sports is the game I've been looking for. It's easy to learn, but not as easy to master. The kids can have fun (and be fairly competitive) playing most of the games and my wife and I don't have to "throw" the game to make them feel good. There is a clear winner, but it's not about winning because the experience of playing is just so darn fun!
I'll give a breakdown of each of the sports included in the game.
Tennis: This is one of the most fun and best uses of the Wii Remote (or the Wiimote as we like to call it). You swing the remote as if it were a tennis racket and your timing affects where the ball will end up. If you have a widescreen TV the 2 player split-screen mode is very fun too.
Baseball: Batting in this game is a hoot. It feels like you're a major league ball player. If you "twirl" the bat while you're in your stance it "twirls" in the game too. The controls are responsive and they translate perfectly into the game. There's nothing like hitting a homerun. Pitching is less exciting as you can only pick from a few pitches and your arm motion is always the same, but if you really get into it and you set up in a normal pitcher's stance it can be really fun. It is really exciting to strikeout a batter though. The 2 player experience is much more fun as the computer players seem to be way too good at batting.
Golf: Golf is kind of hit or miss for me. It's fun to play, but the controls are sometimes not as responsive as I'd like. If you don't pause in your backswing sometimes the game won't register the swing and you'll have to start over. Also the mechanism for controlling the strength of your swing is difficult to get used to. The same "speed" swing but just a little longer or shorter can send your ball in the wrong direction. If you hit the ball too hard (in other words the power meter exceeds it's boundries) then you'll hook or slice the ball. This game is defeinitely more enjoyable for someone who plays golf and understands the mechanics of a swing IMO.
Boxing: This is the only game that uses both the Wii Remote and the nunchuck and also is probably my least favorite game to play alone. With another player it's very fun. You have to keep your hands (holding the Wii Remote and the nunchuck in each hand) either up in front of your face or down in front of your body to guard against punches and you punch by actually throwing punches with your hands. The games go quickly and it's a blast to play against or watch 2 other people play it. The controls are sometimes unresponsive which is a bit frustrating at times. That's why this is my least favorite of all of the games.
Bowling: I've saved the best for last. I love this game. The Wii Remote and the motions you have to take translate very well into the game. It's also easy for anyone to pick up and play. My 5 year old daughter can get a strike and it's not an automatic to me or my wife. When we play our scores are all pretty close. All in all this game is just plain fun.
One thing I would recommend for this game is that you have more than one Wii Remote. I would suggest having as many Remotes as there are players. It can be a real pain to pass the Remote back and forth while playing in some of the games (especially golf since the player order changes so often).
All in all Wii Sports is one of the most innovative and definitely the most fun game I've played in a long time. It's easy to play and can be played by young and old, gamers and non-gamers alike. I think this game is the reason why the Wii has been flying off the shelves since it's launch. If you have friends and family who you'd like to be able to play games with the Wii and Wii Sports is a definite must buy.