I don't know about always. The early Sabbath videos look like any other 1970s dudes. No frills. Just kick ass rock.
As for Kiss, I guess the cover of Hotter Than Hell (the first Kiss album I ever heard when Alive was the new album) made them interesting in my youth but the music is what always impressed me about them and what keeps me a fan of their early stuff after all these years. But then I always liked uncompromising heavy rock.