Congrats, you do a tough job (in actuality, it sounds like a similar job my Dad used to do, I however played clever and earn a decent wage in a charity shop, and then referee for wrestling companies around the UK, mebbe not as "tough" of a job some would say, but a damned sight more fun!)
But the fact remains that you paid through the nose for a game with a vast chunk of songs you dislike... what logic did you use for that if you had heard ALL of the tracks, and disliked half then?
Face facts, if you knew of every song in the game, knew you disliked half of them, yet still bought the game... then who's to blame that half of the songs you dislike? You knew they were there, you knew it wasn't a full game. Stop blaming someone else 'cause you bought a game with a soundtrack you didn't like when the entire game is based around that soundtrack.