Wii Sports is not a game to go out and buy, luckily it comes free with all new Wii Systems.
Once you've got over the initial excitment of the Wii wand/sports bat movement, it soon grows tedious. What makes most games good is the ability to do something you wouldn't or couldn't ordinarily do; scale cliff walls, drive a Forumala 1 car, be in World War II.
Wii sports is fun for about five minutes, and is in no way a contender in the current game race. However it does provide an oppertunity to get used to gaming with the wand and nunchuck.
More of a training level than a game.