I am a True Brawler
I have now unlocked all the hidden characters in Super Smash Bros. Brawl.
Unlocking Wolf gives you a whole bonanza of prizes. First of all you get Wolf, obviously, but you also unlock Events 29-40, All-Star Mode, some music that I didn't pay much attention to, and a congratulatory note that tells you that the Brawl is now really just starting.
I played as Wolf once. He's nothing special. Every character has a different feel (for the most part). Bowser feels heavy. Ganondorf feels slow. Sonic feels fast. Jigglypuff feels light. Wolf feels hollow. It's strange...