Katatonia: Didn't like the singing style, but the melodies were all right. The song was a bit too long in my opinion.
AC/DC: I really don't like them.
HIM: Sometimes I just don't get some music. I don't think it's bad or unpleasant, it's just like I had something missing from my brain needed to understand it. It sounds like elevator music, goes inside from one ear and out from another, not leaving any trace inside the head, although the music clearly isn't like that. This song was an example on that. The rhythm and melodies sounded very vague. I didn't like the sound of the singing voice in the middle of the song, and the album cover was very ugly. However, I liked it better than the other alternative.
Death: I've heard this band mentioned many times on this forum, but I had never heard their music, so was curious what it actually sounds like. And this was the perfect opportunity to hear that. Unfortunately I didn't like it too much. The singer sounds like a witch. When I had listened to it for a while, I started getting a bit used to the sound. I thought I could have listened to more of their songs to educate myself further (ones that aren't covers), but the singing voice is still quite tough to listen to for a longer period of time.
I'm well aware that by this vote I'll be showing my lack of class, but I never promised I had a good taste in music.
Fear Factory: This just isn't my kind of music.
Megadeth: This just is.
Samael: Not really my thing, and I was a bit afraid because the singer sounded like he was going to be sick in the middle of the song. But I liked it better than Possessed.
Possessed: Too rough for me.