Just now I sat down and blew through all 41 solo event matches in Super Smash Bros. Brawl on normal difficulty, to unlock some stages and music. I gotta say, most of them were pretty boring. Melee had weird matches like the hyper speed dash along the Mute City track but the most creative they got in Brawl was making me KO a couple Yoshis while the Pirate Ship level was in the air. Most were basically just excuses to put me in 1v2 or 1v3 fights.
Event Match 41 was also pretty lame. I'm sure it's more difficult on hard but it only took me five tries to beat it on normal. And I would've had it beaten on my first try if I hadn't gotten screwed by items—I was about to KO the last one when a bomb dropped on our heads and I happened to fly off first. Even on hard I have a feeling it's still going to pale in comparison to Event Match 51 in Melee.
The more I play, the more I realize I only seriously care about a few things in Brawl: 1) unlocking all characters, 2) unlocking all stages, 3) unlocking all music, and 4) unlocking all stage builder parts. And I've already completed 1 and 4. Basically I just want to have everything for multiplayer matches available because that's where the real fun of the game is for me. I doubt I'm going to have the patience to grind through all of the challenges and unlock every single little thing like I did in Melee.