THANK YOU for the rewrite, dear WIKI PEOPLE!!!  Now if a student relies on this article for knowledge of N's philosophy, the result will not be simplistic chaos and prejudice.   

 I agree that apollo/dionysus and drama are commonly cited.  A subsection on them would be useful.   

 AS for master and slave morality: the notion that N has a negative view of slave morality is not entirely fair.  He understands it to be an extremely important part of history.  Without slave morality, there would be no science and no higher culture.  If there was nothing but master morality, history would be an eternal stupidity.  His point in writing the book is in part to teach us how foreign and strange master morality is to us  even though it is still a part of all of us.  We identify too much with the good slave in us, and find the good master in us strange and unfamiliar.  To do so, he has to demonstrate the good of the master perspective.   

 To understand Nietzsche's thinking on ethics and the problems of philosophy involved in ethics by constantly thinking of the master slave diad is a serious mistake.  See the work of Brian Leiter, among others, on this.