Porsche Panamera (or whatever the hell it's called). I've heard it's a great car, but I hate it on principle. Same goes with the Cayenne and any other 4-door Porsche. And, in that vein: The 4-door Jeep Wranglers. They've turned Porsche and Jeep into "family" oriented cars to allow middle aged men (and Asian women) to own their "dream" cars and yet still be able to drive their kids to soccer practice. To me, that's the epitome of a company selling out.
Actually... To follow that up: I also can't stand the new Mercedes-Benz GLK and any pickup truck that isn't capable of "working" (IE: oversized wheels, too little sidewall, too much chrome, etc.).