see also: http://www.last.fm/user/more_DeathMetal/journal
analyzed >300 bands from several "death metal" last.fm groups + the outcome is 12 characteristic artists (in this week's update: 96 bands were added, 1 new entry made it into top12, 5 left top12)
Early At the Gates is death metal yeah. I listed them for there influence on the melodic death metal genre. I also listed Opeth only because some people would consider them death metal, or progressive death metal.