It's all about the music. A good song is a good song.

I hate, hate, HATE Arashiro Beni. Positively can't stand anything about her. But I would rather listen to her song, Infinite... for 3 hours straight than listen to Hamasaki Ayumi's For My Dear... once. It's just a better song, even though Ayu is 50 times the artist Beni could ever dream to be.

If you prefer a bad song by your favorite artist over a good song by someone you don't typically go for, you're a silly, mindless, sheep of a fan.