Wii Warm Up: Smash 'achievements'

Whether or not you've gotten the chance to play Smash Bros. Brawl, you've probably heard about the game's achievements challenges and rewards. This system is somewhat similar to earning achievements in Xbox games, although not quite.

We really like how Brawl handles challenges, but what do you think? Do the challenges add any depth to the game? And, how do they stack up when compared to achievements on Xbox titles?

Also, if you do own the game, have you used any golden hammers yet to unlock any rewards? If so, on what challenges?