I've had my MK6 GTI for about 5 months now (5000 miles).
There's some faint rattle coming from the cubbyhole behind the interior light switch when I'm driving on the motorway, and I've actually had this problem since the day I got my car. Haven't visited the dealer thou, because the rattle seems to come and go.
What I've noticed after about 3 months of ownership, are the loud 'rubbery' squeaks from the doors/bootlid area when going over speed bumps or driveways at a slight angle. I've never had this problem in any of the cars I've owned so far (which includes a BMW 1 series, Honda Civic and even a Mazda 2!).
I have to say the interior plastics and the switch gear materials are very high quality nevertheless, but I'm less than satisfied about the build quality.
