Indiscipline, this is a strange idea for a round. I'd hate to be eliminated because you liked my song better than someone else's.
I hear you, and you're not the only participant feeling at odds with this reverse mechanic. I believe trying one time to guess what I don't like is fairly balanced by having tried four times to guess what I like. Plus, as I've been capable to shot down good songs for a single tiny aspect, I'm perfectly capable of salvaging shitty ones for a bit I may love.
All this simmetry is making me dizzy now.
To semi-quote Ramsey Bolton, "if you expected a sensible roulette, you haven't been paying attention"
EDIT: One more thought, especially for the growls-peddlers. I haven't been throwing tens around for gems, can't see why I should easily do it for turds.