Great game at the beginning, but not very good when you play the game for over 1 week+. It's fun whenver I play with friends for a while, but once my friends go, or it's been over an hour, the fun STOPS.
I suggest one of these game (in order from best to not as good):
1) Super Smash Bros. Brawl (If you don't have this game and you have a WII, you are definitely crazy!)
2) Mario Kart WII
3) Star Wars: The Force Unleashed
4) Super Mario Galaxy
5) The Legend of Zelda: Twilight Princess
* P.S. Some of these game are good for one-player action, and some others you can have a blast with you and a couple of friends. If you are looking for games that'll last a VERY VERY long time so you and your friends can play, I suggest Brawl and Mario Kart. Otherwise, if you're looking for some one-player action, get Galaxy, Twilight Princess, or Star Wars.
Hope I helped!