If I am listening to classical, celtic, orchestral scores, ambient music, etc., then of course the music is what I pay most attention to. In music with vocals though, the vocals are just as much a part of the music as the instruments are, and in fact are the lead instrument. Grunting is an atrocious instrument that I cannot tolerate nor recognize as having any type of musical quality or value to it. Much in the way how someone scraping their fingernails down a chalkboard would be and trying to pass it off as "music". Imagine a gangsta rapper coming in the middle of one of your favorite metal songs and talking about some nonsense and mispronouncing all the words. Or someone who just yodels. Grunting is not one iota more of an improvement over rapping/yodeling to my ears when it comes to music.
As far as "Nephilim", I don't really find the chorus that bad. I like how the vocals are layered and makes it sound more evil and I like how the melody is. But they just don't really go anywhere.
LifeDepraved, because I llike to hear a vocalist actually sing instead of trying to sound like a Sesame Street character, you assume that I listen to the radio or even the top 40? I cannot stand the crap that is on the radio nowadays and I haven't listened to it for years. Every band/song I listen to now is discovered solely through the internet on band forums or suggestions from websites/other people who know what type of music I enjoy. That does not mean I listen to top 40, nor does me liking some bands who just happen to find mainstream success. It means I listen to whatever sounds like music to me and that I want to hear actual singing. If I want to hear growling, then I will just tease my dog with a bone. I don't want it in "my" music.
Jack