>>100448493She's annoying and unlikable, she's terrible at singing, she never has good lines, her entire aesthetic is cringe, and in a show full of one note characters she still manages to stand out as particularly generic, I'd say she fails to capture the charm that makes the archetype so prevalent, but honestly I can't name a good rocker character and have no idea why they keep making them.
Compare this to Lynn, the sporty tomboy who's crass, energetic, competitive and at times ignorant of social queues. This actually provides a good basis for comedic situations and episode plots.
Luan, the comedian, the prankster, the clown, the mime, interjecting with relevant albeit unsolicited jokes and wordplay, setting scenes with pranks and practical jokes, sometimes dragging this to the point of insanity
Lisa the scientist providing information the family needs, INCREDIBLY numb to social queues, witty, condescending (though rarely malicious)
They have actual character traits that create funny situations. Luan is only ever useful for sitting in the background playing the music while others do more interesting things, and honestly, you don't need someone to play the background music, no one would care if the music came from nowhere.
You could replace her with a boombox and no one would notice.