I was just generalizing.   I've heard enough of Slatyer to realize that their vocals don't do anything for me.  I think they sound stupid as hell too.    Heavy metal just isn't my cup of tea.
I understand some of the shit they do with the guitar is pretty sick and impressive shit... But like I've said, I don't give a fuck.   He could play the guitar with his dick blindfolded and I still wouldn't like HEAVY METAL because it just isn't my style.  
Again I was generalizing, I know that every metal band isn't Satanic, or pretending to be Satanic.   But I'd say generally that most of them play the, "I love the Devil," card.  Am I wrong?
I'm not even defending Linkin Park, they are just "OK."  I'm just saying there isn't good or bad music, except in your own mind.