How effective is Harper Lee's use of Scout as narrator of the Southern Gothic novel To Kill a Mockingbird?

In my opinion, Harper Lee's use of Scout as narrator of
this story is clever and exceptionally effective.  Because Scout, as a child, is an
innocent, her recognition of evils and moral wrongdoings resonates particularly
powerfully with readers.  Scout is often unaware of the cruelty and potential for
badness present in her fellow Maycomb citizens, but, when she does intervene or become
cognizant of a wrongdoing, her reactions to the prejudice, ignorance, and other negative
characteristics of many events and people in the novel come purely from a place of
goodness and purity. 

Due to the fact that she is a child,
and especially because she has been raised in an atmosphere where she has been protected
from developing poor moral attitudes, etc., Scout is able to view the world as
consisting almost completely of areas of black and white; there are very few gray areas
in Scout's outlook on the world.  Lee was obviously aware that presenting a story that
encompasses so many lessons in morality would be most powerful if it was revealed as it
might have been seen through the eyes of a child.