All car makes have their problems and its usually luck of the draw.
With my E90, so far I had the passenger seat leather unstitch, steering column changed, wear on various interior pieces (i only have 12k miles), rear window motors needed to be replaced, rear window moulding came off..
These problems are not major but they are annoying. When you pay 40k+ for a car, you would think these things wouldn't happen.
When I had my A4 the interior stayed immaculate for the 7 years that I had it and with the exception of differential seal (parts = $17), it was problem free. Yet I know others who had a shit load of problems with their A4's..
BMW, please get rid of the RFT's and give us a spare tire!