It depends on which book you read and which part of the book. The earlier books Olympus was a nice breath of air compared to the Badlands. In Book 3, IIRC, New York was in the worse for wear, but Olympus was starting to show it's gritty side. By the end most of the action takes place in gritty parts of the city.
But the city in the trailers look like it's on flatlands where Olympus in the books look like it was built on hills, where houses are stacked on top of each other, much like L.A. It makes for a more interesting, messier vista.