Most of the people I've tried to get into Opeth have hated them, because of the growls. As one of my friends put it, "All that RAAARGH RAAARGH death metal shit SUCKS!" (And he owns a record store... go figure.) My girlfriend enjoys the clean vocals and progressive elements, but really only one person I've played them for has gotten into it, and that's my boss. Everyone else just pans it universally because a) it's metal or b) it has death vocals. Even the compilations I've made for people featuring only the clean tracks have been dubbed "boring" by those individuals. I just can't win. Blah.