1996 BMW Z3 1.9 2dr Convertible
Had Z3 2 years now, bought used. Door handle pulled off/common defect. Light switch is a pull switch, but the snap-on cap that covers the screw-on bolt is also snap-on. Duh. Location of window controls in center console results in shorts because it's next to shifter and gets dirty. Windows sometimes don't roll up/down. Cat. Converter bad, rattles like mad. Top rattles too. Trunk leaks. This was a factory approved used car. I've talked to others who have cited similar experiences. Maybe an older model you buy will have these things fixed, maybe not.
Lots of fun to drive. Only car I've owned that is in a game (XBox).
Test the product internally and don't let the consumer do the testing. I've had BMW before and this was a big disappointment.