Too much.
New rear door seal, mis-aligned rear door (both under warranty).
New driver's door lock (after an 8 month wait, under warranty).
Tracking badly out - I think ever since I had the car (not under warranty).
Steel wheels starting to rust.
Broken plastic trim - still waiting on order for 4 months (under warranty). Dealership broke dash vent during service, it took 3 months to get one, it turned up, it was the wrong one, another two months for the correct one to turn up.
The car itself is very good. The engine is quiet, refined and economical. Handling is a little soggy for some tastes, but the flip side is an excellent ride quality. Steering is overly light, but allows very easy parking.
Stereo adequate. The de-mister system is hopeless, it is worse than a Mini I once owned. Seats are slightly too hard, but adjust well. Rear seats cramped for adults.
Dealership service is hopeless. The car is a 5dr, I ordered a 3dr. I was not prepared to wait another 16 weeks for the 3dr to be built. It appears every part, except service parts needs to be ordered from Germany, this takes between four weeks and 8 months. The dealer is unhelpful, and useless.
Obvioulsy you have had a bad experience with your dealer.
I have the same car as yourself and have received excellent service from my local dealership. I had a faulty throttle body which was knackard and they replaced it under warranty. The said part being ordered from Germany - arrived in little under a week.
I suggest you look for another dealership - as they do differ in service/customer relations etc.