First and Last and Always will always sound darker and more gothic than the later albums which sound more like hard rock/psychedelic . However, think Andrew Eldritch's voice is what makes this band unique in underground bands. Glad this band never made it to mainstream and always kept underground.
The Sisters of Mercy is the only true black metal band in the world. They also combine classic pop music with rap, techno and cheesy death metal operas. I can't think of any other painter who cooks such delicate movies.