What did Fitzgerald achieve by using Nick's point of view to tell Gatsby's story?

At the beginning of
,tells us about how he, because of his father's advice, tends to reserve judgment about people. 
This immediately establishes him as a narrator who tells us the events without a great deal of
judgment, letting us do our own assessing of the .  By having Nick tell us the story , we get to
see through the eyes of one of the participants in the events which draws the reader into and
closer to the story.  Also, since Nick is in a social class that falls between Gatsby and the
Buchanans, we are given a more impartial glimpse into both worlds.  Finally, Nick lets the
reader know from the beginning that he somewhat understood the very complicated character ofwhen
no one else did.