No need to redact, you're entitled to your view about Metallica which was entirely reasonable. (I read it on email)
It's personal as it just depends how you visualise things. If there's a good beat or melody or both, I can usually visualise.
The trouble with rock is many songs have long periods of vocal led music where there's nothing to sync to. eg an Absolute Classic Song "Fortunate Son" by Creedance Clearwater Revival. The defacto sound track to practically every war film out there from the 60's. However, after the initial drum beats and guitar strumming, you have practically nothing but vocals for most of the song.
I can visualise to the songs above, but as I said it's personal. I also personally like Enter Sandman.