Wii Sports proves to be a great game for an introduction to the Wii
Tennis: Very fun, but repetitive. You can flail your arm around (which I do quite often) and get along just fine. Other than that, it works pretty good.
Baseball: Very challenging, but works just like real baseball. You pitch like real-life and you will most likely have fun playing this game.
Bowling: Probably the most realistic and fun game on Wii Sports. You can curve the ball to pick up spares or strikes, and you can zoom in to find the point where your best throw is. The game works like real bowling, just without the weight of the bowling ball.
Golf: The game works well for the most part. It gives you an accurate read-out that allows you to figure out where you need to hit. And it also gives you realistic physics so when the ball hits, it rolls. But when putting, it gets VERY sensitive.
Boxing: This game is a lot of fun, but very sensitive. It's not as sensitive as putting in golf, but it needs to be done just right in order to get it right. The game can only be used if you have two remotes and two nun-chucks, so that's a down side to the game.
Graphics: The game comes with the system, so the graphics aren't all that great, but they are serviceable, so it works for the game.
Gameplay: Very realistic and worth the $250 you pay for the Wii. And if you don't have the money for a new game, it will last you a while.
Sound: Every time you hit a ball, you can hear it in the remote, so that's a plus. But the music in the game can get repetitive and annoying.
Value: It's worth it, it's fun, and it will last you a while before you get bored.
Overall: It's a decent game for a launch title, and it definitely shows off what the Wii can do.