I guess this is gonna just have to be one of those stylistic preference things where you and I differ, but the way I see it. "singing lessons" and people who come to metal to hear melodious voices and graceful songs are, plain and simply, missing the entire point of "METAL".
There are groups I like I can't even understand what they say without a lyric sheet.
That.
Ain't.
The point.
I don't listen to metal to hear the words. I listen because the instruments kick ****ing *** and are nice and FAST and go well with my pushups and punching stuff and the blowing off of steam.
And again, there are exceptions, such as Nightwish, who have a singer with a beautiful voice, but again, I ain't listening to her, I'm all about the score.
So yes.
When I want specifically to hear "METAL", and I hear a group whose very name, METALlica, implies by its existence that they are the kings of METAL, and then they give me country, I'm gonna get pissed off.
They all must either abandon this apostate's path, or else change their name to Countryica, or at least surrender the name "Metallica".
Any rights they had to be called "METAL" they have lost until they atone.