I like metal, but not the same sub-genres as most of the stuff you posted. My favorite band that would be classified as metal would be Protest the Hero (Progressive Metal):
https://www.youtube.com/watch?v=8l_V2a5ZTqQ
I'd say the lyrics and vocals for most of the bands I would classify as metal tend to be unappealing to me. Something about the lower vocal tones and the overly brooding lyrics just doesn't jive with me.
Then you have bands like Between the Buried and Me, who I absolutely love instrumentally but they go overboard with the screaming. I see screaming as an extreme end of the vocal emotional scale, so when you are always hanging on the extremes, it loses its power and fades into monotony...







