There are plenty of reasons to not buy an Audi. Many also apply to BMW. But FWIW, the B7 A4 doesn't require bumper removal to change the headlight bulbs.
http://www.audizine.com/forum/showth...e-front-bumper
I've only owned one VW, a MkIV Jetta. It was very easy to work on. Which was good... because I worked on it. A lot.
It was fun getting a phone call from my brother asking me to confirm that he needed to calibrate his car to a new battery (E90 328xi).
Modern cars can be a bear.