I would have to rank as follows:

1. Melody

2. Hook Line / Chorus

3. Music

4. Vocal Performance

5. Story Line

6. Song Structure

7. Lyrical Detail

I am sure there will be plenty of questions as to why Lyrical Detail is last. That's just the way I see it. Radio is the average music fan's medium. If your flipping through the stations , what catches your attention first, the melody. If you don't like the sound, you keep going, or should i say if it doesn't interest you. Sometimes something different that cathces your ear will make you stick around.
Just My Opinion.