Their whole goal with this car was to make a sedan that was 4-door, spacious, luxurious, and still had the power of Porsche. The front end was supposedly inspired from the 996 models and, despite the controversy, the back end still has the 911 arch/slant...which is what they were going for. And why would you use the Cayenne rear?? It's a sedan...not an SUV. If you actually look at the car you'll see that the style is, in fact, typical Porsche. People complain about it being too wide or big or stretched, but the fact of the matter is that if you're gonna have a more spacious car, it's not gonna look exactly like a 911, but it can be close. That's what they accomplished.
 
To me, the car looks like it fits in with Porsche perfectly. I think the front end is gorgeous along with the rear, but that's just my opinion 
