All right, I'll give this a go, even though I've only listened to a very limited number of metal bands, and none of them listed on this round. Fortunately, good knowledge on metal is not needed here.
I only listened to the songs suggested above, and not the entire albums.
I didn't like King Diamond at all, and the spoken parts in the song sounded very disturbing.
Hammerfall was more to my taste, although the subject matter of "welcome to the Metal Age" sounded a bit, um... Or maybe I just misheard/ misunderstood the lyrics.
Coroner was heavier stuff than I normally listen to, but it was surprisingly groovy. The singing style in Suffocation makes me laugh, I know they mean business, but I can't help it. And their music wasn't melodic enough for me.
I really disliked Deftones for some reason, and wanted to turn it off way before the song ended. I don't think I'd categorize it as "metal", and I didn't like the sound.
Dark Angel has a cool name, the song was too fast for my liking, and didn't really seem to go anywhere, but I chose it anyway.
Dismember was too heavy for me, and I didn't like the singing style.
Alcest's song sounded like it had a good basis, but the song should have been produced further to make it fulfill all its potential. The vocals had a very odd rhythm, like the words didn't fit the melody at all. I found the song too long, but it was much better than Dismember.
Hmm, it would seem that I'm now showing my ignorance on these bands very openly for everyone to read, which is not something I usually do. But at least I listened to the songs, and not base my votes on the colours of the band members' dogs or some such thing.