Lyrics are over rated and under rated. Over rated because they tend to be the main drive of a song and the up front focus, under rated because people tend to ignore them as a part of the song in a musical aspect. I think that good lyrics are ultimately something that comes from the heart and reaches out to the heart. They could be about killing and rape, a bad experience, love, hate anything you want, just so long as they come from the heart and reach to the world with feeling.