My musical tastes are pretty varied (for every metal album, I have a jazz album, musical soundtrack, classical album, or nerdy anime song collection) and for each genre my tastes vary. For musicals, I like to feel the emotional storytelling of the music, and for anime BGM I like the imagery it conjures or the stories of the characters when they sing image songs. But for jazz, I really like songs as opposed to individual artists, and with metal I tend to like the artists and their overall look, act, lyrics, sound, etc. Motley Crue is my favorite and it might be because I know a lot about their wild backstories and how their growth is reflected in their songs, for better or for worse. Alice In Chains is definitely up there in my top five. I really like "Man In The Box" by them. Shame their singer passed away, since I discovered their music later in life.
Ah, also with metal bands the live performance is a draw. Mr. Big to me was always a lame band, I thought, until I was dragged to their concert. They are really amazing musicians! They aren't metal, but they came out of the party metal era. Motley were great live, too.