"Melodic deathmetal" is an musical oxymoron that should never have been created IMO. And Gothenburg is the capital of this hideousness aswellas as the idiot powermetal garbage.
Sweden has a strong music tradition and I think we are the worlds #3 music exporter after the US and Britain. Metal is a large part of the music output in sweden although its not recognized in mainstream media.
Im not active in the genre anymore, so I cant really give you any tips of Swedish quality metal other than the regular Entombed, Dark Funeral, Marduk, Haunted or Nasum. I tend to listen to noname grindcore acts on 7"