Your list is full of things that can easily be avoided and/or turned off.
The dumbed-down gameplay can't be turned off.
Single-player can't be avoided to unlock everything.
The art style can't be changed.
If I were to turn off every contrived stage I'd be left with about five stages.
If I turned off every powerful item I wouldn't be left with much.
I could mute the sound and whistle my own music.
Uninspired Break the Targets stages can't be avoided.
Filler content takes up space which could be used for more... game.
Most importantly, the effort used to create many of these things was taken away from expanding the multiplayer mode.
What am I left with after all of that? Not much. Brawl contains almost nothing that I wanted. I suppose that deserves being responded to with generic "you fail" messages because it was everything you wanted. It's an opinion, it differs from yours, that doesn't merit a "fail" response.
MY GOSH, IT'S FULL OF STICKERS
Way to nitpick on a SINGLE complaint I have. I have hundreds more, and they all add up.