The first chapter of The Great Gatsby contains Nick's initial descriptions and insight into his future friend, Jay Gatsby. What is interesting is that he doesn’t seem all that fond of Gatsby or at least of what he represents. In fact, he clearly states that Gatsby "represented everything for which [I] had unaffected scorn."
This would seem to show that Nick would not like Gatsby, but they clearly become friends, and, in fact, later in the chapter he says that Gatsby "turned out alright in the end." What ingratiated Gatsby to Nick was his sheer romanticism. While the wealth and excess are initially off-putting, his overwhelming passion and devotion to Daisy and his willingness to use all of his extravagance to that end changes Nick's perception of him.