If you increase the polygon size, things will go from terribly blocky the smoothed and refined. Hold your mouse over the right side bar(I know nothing is there). A small assortment of options will now be displayed along the side. At the very bottom is 'wireframe resoultion'. Click this to bring up a list of different resolutions. The higher you go, the better it looks, and the smoother it becomes. But beware, for the larger the resolution, the closer the wireframe wires become, almost losing its 'wireframe' look on the highest resolutions. If none of the options still looke right, you can always use a grid type pattern as a texture.