It looks terrible. Overly stylized, and much more focused on aesthetics, not the story. Plus I've heard it takes a lot of liberties with the original story. Modern Hollywood fucking up another classic story.
Also, Tobey Maguire looks like an idiot in all his movies, and though I usually like him, Leo D. looks like he performed terribly in this.
Watch the original with Robert Redford if you want to see a Gatsby movie