What Porsche does best is take something that ought not work, and make it work insanely well. The 356, especially the Pre-A cars, was heavily related to the Beetle. The beetle was not a car with sporting intentions. It made very little power, and the handling could be a bit spooky. Nonetheless, Porsche took the basic idea of it and made a sports car, and a very good one at that. 356s often get classed into higher displacement classes for vintage racing because they simply go and change direction better than they ought to. The 911 took the 356 idea and turned it to 11, then 12(911 RS), then 15(930), then 27(997 GT2 RS).
Fast forward to the early 2000s, and Porsche is looking to expand their product line. They add an SUV, but they wanted one that could do everything. The Cayenne can be used offroad, and it(for a stock unibody SUV, and not so much the GTS) is very capable. As it happens though, it also goes like the clappers. It is a format that shouldn't work, but with the GTS Porsche took something that shouldn't do what a sport sedan can do, and made it do that anyways. It's Porsche being Porsche just as they always have been. Just because it is an SUV and you don't like SUVs, that doesn't make it not a Porsche.
I hate to tell you, but there are people out there who hate track-day-loving, back-roads-hooning, sports car lovers as much as you hate tall "yuppie mobiles." Porsche has always made Porsches, and will for the foreseeable future. The Cayenne is a real Porsche, and I'm happy that it exists. May it rip about with alacrity on all surfaces until people stop buying them.
I get that it's hypocritical to criticize an SUV driver for driving on the road rather then driving it off road, because Ferrari owners don't drive their 458 at 180mph everywhere either.
However.... when you take said SUV and give it the sports car treatment to me that's like taking a 458 and puting it on 26" off road tires and a 12" lift kit to make it amazing off road.
It's just a bit weird.