As you said, I personally care both interior & exterior. I confess that German makes more elegant & accurate interior than japanese. For example the red meter-panel at nite in Jetta, It just looks fantastic, and the postion of the CD-drive & Air-condition. They are all convenient to reach and have reasonable position.It just fit everywhere in my eyes..The only problem for those European car is MONEY....
They are too expansive. As you said there are too much to concern when you wanna buy a car, but for me, I personally will go Engine Size, Car Size first then electronic and luxury stuff.
Plus, Japanese cars have most advanced electronic thing equiped. I meant when we compare car at the same level..of course if you are gonna compare a mercedes-benz or a lexus with a honda accord, this just wont make any sense. Personally I thin Engine is the heart of the car,so when we compare cars ,they have to have the same size of engine first.