There is so much to do in Smash Bros Brawl that you can spend an entire day and still not have unlocked everything. Even if you do you still need to go online and test your skills against your friends or other opponents. Brawl is a game that you will continue to play on and on without tiring.
Absolutely the best game on the Wii. If you've played Smash Bros in the past you will know that it is a great game, if you haven't then what are you waiting for. This game is a must buy for anyone that has a Wii.