Weak
Seriously, the vocals are part of metal music. The harsh vocals are used in around 90% of metal songs, and it doesn't ruin it, it completes it. You may not like it, but it's part of the whole package, it's like opting to take the woman (dunno who she is) out of the Mona Lisa because she gets in the way of the scenery. It's part of the song. I'll agree that sometimes it doesn't work, but more often than not the vocals accurately follow the overall feeling and direction of the song.
I used to be like you, I used to love the music, but the vocals shitted me to death. But it's an acquired taste, and once you learn to love it, is MASSIVELY expands your music taste in metal, there's so much variety once you get past the vocals, and it's all so awesome. Have a listen to some of the first metal songs I liked
And a couple I developed a taste for later:
and just for fun:
^ My favourite at the moment, can't get enough of it
EDIT: for those complaining about not hearing the lyrics, let me share something on that. I hate being able to understand everything that's being sung. I also hate knowing the lyrics before I know a song, because I often find myself listening to the lyrics rather than the music. I always get to know the music before the words, and if I hear the words before the lyrics i find it hard to enjoy the music as much. This is one reason I enjoy listening to bands like Rammstein so much because I don't know, or care, what they're saying. And if I want to find out I look it up, and I'm not saying lyrics are unimportant, they're just secondary to music. So if you can't understand what the singer is saying, and that's why you won't listen to death metal or something, get over it. Seriously, you don't need to hear the lyrics, and if you want to know what they are, look them up