jrb, here's the list (and I still LOVE my GS!)
1. Both doors could only be opened with some force (was fixed)
2. Engine can sometimes not be started. It works again when I open the driver door and shut it (was not fixed, but only happens rarely and got rarer over time; no comment from dealer)
3. When driving over road bumps, sometimes all the lights in the cockpit blink, the rpm meter falls to zero; after 2 seconds all is fine again (was not fixed; head mechanic says he would have to check all cable connections and has not had the time for this...)
4. Sometimes the "Sport" mode falls out itself with no apparent reason (not fixed; no comment from dealer)
5. Door rattling (as discussed, not fixed; no comment from dealer)
6. Slight noise from steering wheel center when maneuvring (not fixed; comment that they did not hear it...)
7. Petrol cover did not open when I wanted to fill up (was fixed, reason was spring with lack of power)
8. Sometimes slight screetching sound when accelerating (normally) from standstill (not fixed; no comment from dealer)
9. Power windows have once not worked properly when I closed the door (they are supposed to automatically lower themselves slightly so the door closes properly), with result that the window was smashed against the car body. To my surprise, nothing broke (not fixed, but happened only once; no comment from dealer)
10. Factory-installed CD player sometimes says "no medium" although a CD is in (and no, it happens with original CDs, no self-burnt ones) (not fixed, no comment from dealer)
11. Key's grey rubber cover of the "open/close" button has torn (and no, I do not have long fingernails...) (not fixed, no comment from dealer)
12. Watch runs ahead maybe 2 minutes per month (not fixed, dealer comment that he cannot fix this)
13. Petrol reserve gauge is very non-linear: does almost not move the first 100 km after I filled the car up, after 300km the gauge starts to fall very rapidly (cannot be fixed according to dealer)
All in all, in above list, there's nothing that keeps me from using my GS as an everyday car, and I love it to death! Would I buy it again? Absolutely!
Would I be happier with better dealer support? Definitely!