Opposite experience, here. I've never had aesthetic, chassis, or body panel issues, but the M3P has been endless problems:

  - I've gone through three 12v batteries in four years.
  - I've lost 40% of main battery pack capacity in four years (the first chunk of lost range was within a month of purchase).
  - The rear camera randomly loses signal while trying to back up.
  - Wifi Radios are incompatible with Ubiquiti Nano HD radios.
  - Software updates are a fun game of "ok, what won't work after this one?" or "Which critical UI functions did they move to a completely different place this time?"
  - Autopilot has tried to kill me several times: usually with random hard braking for no reason, but once with a completely incorrect and sudden lane divergence.
  - Most recently: the climate control system stopped working entirely a month ago. If I try to turn it on, the car has an electrical fault and I can't drive. So, I get to sweat profusely while waiting for a timeframe I can afford to be without the vehicle for the week+ it will be at the service center.