I understand you have your preferences. I'm not real familiar with Destruction or Watchtower but I do know of Bathory.......and these vocalists are not suppose to sound like James Hetfield. Total different category of music style and yes they do vocalize in deep tones....although i dont see where you get the redneck association from....lol.
I associate Bathory with Viking metal (IMHO their best work) though I know they have dabbled in the thrash/speed/death/black metal, too. I'm sorry, but I can barely understand the lyrics of their thrash/death stuff. The vocals are extreme, that's for sure; loaded with shrieks, screams, and growls. I don't really associate those extreme vocal styles with thrash.....maybe more suited to black/death metal.
I'm sure you are aware that Metallica, actually the big 4, paved the way for some of these more extreme, hardcore metal bands. I do respect Metallica for that, and there are songs from Metallica I really enjoy. But as a whole, I'm not fond of Metallica or James Hetfield as a vocalist. I feel he is mediocre, ya know.