In magazines, catalogs; actually in every printed material we always see the front ends of the cars. Of course, they will show the front, because the car is moving forward not backward. So the back is not that important! However, some cars does not have that good looking design at their back ends. May be design teams did not pay the same attention to back end ;) However some cars have a very good looking at their back end like their front end ;)
Porsche 911 - Mercedes SL65 AMG Black Edition
Range Rover - Ferrari 458
Maserati GranTurismo - Aston Martin DBS
Pictures are from;
Porsche, Mercedes, Land Rover, Ferrari, Maserati and Aston Martin Websites