Wii Sports is the best example of a starter Wii game that shows you just what you're in for
Wii Sports is a collection of sports centered games that help you understand the Wii's motion sensing a bit better. Each game allows you to use a Mii character you create. Thus, Wii Sports can get really involving.
Tennis is first on the list. Tennis is probably the most active of all 5 games. The concept: an auto moving Mii character has to hit the tennis ball back and forth from one side of the net to another. You swing the Wii remote very precisely in order to hit the ball where you want it to go. You can even lob and silce your hits making it more fun and involving. As you progress and your skill points grow, you are faced with more challenging, smarter opponents. This can lead to some lengthy matches. Trust me, I've played a few that lasted up to 30-45 minutes. After long matches, your arms feel like jell-o. Overall Tennis is great with friends, just make sure you have lots of open space.
Baseball is different. The concept of Baseball is to use your Mii character to hit the ball with the bat, or pitch the ball by making motions. Hitting the ball can be frustrating, that usually means you'll hit more fouls than fielders. To add to that, you can't run bases. So that means if you hit the ball anywhere near the middle of the diamond, you're automatically out. Baseball is more about luck than anything, and usually results in quarrels if you add a friend to the mix.
Bowling is the best part of the compilation. Other than being completely fun/relaxing/competitive to play, bowling is the deepest game too. Your Mii rolls the ball down the lane to hit the pins. Deep within all of this, you can: move your position, zoom in on a selected area to see your exact position, curve the ball, and roll the ball into the audience and make them scream. Bowling is up to four players and really fun with other people as well. The best thing is that when you play with people who never played Wii Sports before, they seem to pick it up quick
Golf, golf is... broken.
Boxing is the most intense. The concept is to use your Mii character to punch, jab, and uppercut another opponent. Boxing is really exiting with a friend and is also the only game in the package that uses the nunchuck.
Along with each sport is training modes, which are fun-based minigames that help you on your skills. You can even take a Test that is much like Brain Age. You do an event for each sport and depending on how good you are your "Wii Sports Age" will be high or low.
Overall Wii Sports is the ideal beginners game. Sure you wont be taking this game for a spin a lot after you get more Wii games but it's great with friends and great fun all together.