Can we complain about how there are no "classic" Kid Icarus stages or characters too? Or that Yoshi isn't based on Super Mario World anymore? Or that Toon Link isn't NES Link? Zelda II was basically completely ignored already, and now Link's up air was changed. What the hell, Sakurai.
You can get your point across without sounding like a sarcastic douche. Actually, no, you can't, because there's no reasonable explanation for this.
Wario Land: Super Mario Land 3 - Sticker in Brawl
Virtual Boy Wario Land - Ignored
Wario Land II - Ignored
Wario Land 3 - Ignored
Wario Land 4 - Ignored
Wario World - Ignored
Wario: Master of Disguise - Ignored
Wario Land: Shake It - Ignored
I'm surprised Wario was even considered for Melee, given that WarioWare didn't exist back in 2001. How cool would a stage based on
Wario's Castle be? Or
Glittertown from the fairly recent Shake It?
Over 6 years ago at this point. And I'm not sure Shake It was very successful.
Game & Wario is the worst selling game in the Wario series behind Virtual Boy Wario Land. Relevant, maybe, but that doesn't give him an excuse to blatantly ignore eight other games.
Wario's victory theme is from Shake It
Shake It was released after Brawl, so I'm not sure what point you're trying to make.