Like Nick, Gatsby comes from the Midwest (North Dakota, although his father later comes from Minnesota). Early in the book, he is established as a dreamer who is charming, gracious, and a bit mysterious. As the story unfolds, however, the reader learns more and more what precipitates the mystery: that everything he has done in his adult life has been with the sole purpose of fulfilling the most unrealistic of dreams — to recapture the past. Gatsby is in many ways, as the title suggests, great, but when looking at him critically, some of the things he stands for may not be so admirable.
In one sense, Gatsby's rags-to-riches success story makes him an embodiment of the American dream. He started life with little, as the son of fairly unsuccessful farmers. By the time he was a young man he had even less, having voluntarily estranged himself from his family, unable to come to terms with the lot he had been dealt in life. While on his own, he had the opportunity to reinvent himself, and due solely to his own ingenuity, Jimmy Gatz evolved into Jay Gatsby. As such, life became much different (although he was missing one key ingredient: money). He was no longer tied to his early years, but could imagine whatever past for himself he desired. And then he fell in love, a fateful incident that would change the course of his life forever. After meeting Daisy, everything he did was for the singular purpose of winning her. Money was, essentially, the issue that prevented their being together, and so Gatsby made sure he would never again be without it. Gatsby's drive and perseverance in obtaining his goal is, in many senses, commendable. He is a self-made man (in all respects) and as such, is admirable.
