Struggling to understand what your problem with it is. I think you are trying to read too much into things. It's a car. Porsche have released it in response to most other manufacturers releasing similar large coupe's - Merc CLS, Mas Quatroporte, Passat CC, Audi A5, and many many more on their way (Ford are releasing a Mondeo derived one). All cars that share the same concept, just aimed at different demographics. It is a market sector, no more, no less. If you don't like its styling, then that is your taste, but styling sometimes needs to be compromised by practicality and functionality requirements - remember the Audi TT that was style over substance and turned out to be unstable at high speeds resulting in deaths? Just accept the fact that Porsche are no longer one-model car maker - which is a good thing. If you want ugly look at the Masser Quatroporte. Though the proportions of the Panamera are a little... unconventional, I don't think it is ugly. Behind the wheel it certainly looks like a nice place to be, and when you're inside you can't see the exterior so what does it matter?
I can certainly see the appeal for this type of car. I've got a young family so family wagons i'm looking at are basically large estate cars. But in a few years time when I still need a large car, but not necessarily the boot space I'll certainly be pumping for a car of this type - though unfortunately not the Panamera or anything of that level of prestige - unless they depreciate about 90% of their new cost over a few years.