Just picked up brand new Mk 7.5 Golf R a week ago.
Wearing it in slowly. I quite the car, but hate the rattling. Makes the car feel cheap and tacky like a '94 Hyundai.

I have rattles from
1. Both driver and passenger door trims caused by road vibrations and music - stops with application of pressure
2. Rearview mirror housing rattle caused by Soundaktor and music.
3. Soundaktor rattle
4. Dreaded 3K RPM metallic ringing noise.

really disappointing for a $57,000 car.
not so concerned about the first 3, as there are solutions for this, confirmed by dealer, being fixed under warranty.
nothing (yet) can be done about the metallic ringing noise.