The Great Gatsby is my favorite novel, and I'm a die-hard Fitzgerald fan. I disagree with the idea that the book is some critique about society, certainly that's in there but it's just a side effect of accurately describing society at that time.

The book is about the green light, it is about chasing a mirror image of yourself, Gatsby never wanted Daisy he just wanted the image of him that he dreamed about and she was a part of that fantasy.