I have been traveling the last week and so have missed a bunch of threads but felt the need to chime in on this one.
I am a bit of a car nut, but I don't own, and have never owned, a VW diesel. However, based on what I have read, the VW diesel gets way better gas mileage than advertised. Usually when cars are tested for fuel efficiency in real world conditions their actual fuel efficiency numbers are considerably less than the EPA numbers. Based on what I have read about the VW diesels, the real world numbers were actually a fair bit better than EPA estimates. Something to throw in the hopper - I have no vested interest one way or another.
As for buying a Hyundai or a Toyata or a Honda or an Acura . . . yeesh . . . I guess that works if you view a car as nothing more than a soulless "transportation appliance" much like a toaster or an oven. Personally, I have to love (and feel a personal connection with) the vehicle I drive, and the way it drives, and I wouldn't be caught dead driving most of the cars made by any of those brands. But then, I wouldn't drive a car that had less than 300 HP, but that is just the way I roll. One day, when I have one foot in the grave and the other on a banana peel, I will probably have my first Acura.
I would also note in passing that the worst experience I have witnessed with a vehicle is the experience my wife had with her Toyota - it spent more time in the shop than in the driveway, with horrific customer service all around. I realize though that one bad apple does not mean the entire tree is rotting - nevertheless, this experience only serves to solidify my view on that particular brand.
Good luck in your shopping.