Here is an alternative perspective, so bear with me.
My kids close my doors with enough force to push me out the drivers door (they get shouted at for it, but doesn't stop them). That makes a hollow boomy noise. What I've been trying to teach them is how to "close" the door properly.
They do sound clunky if you close them like you would a Vauxhall Astra. With just the correct amount of force behind the door and the mechanisms being in good order mine shut and sound exactly as you would expect a BMW to - and without the boom!
One of the biggest criticisms about the E85/86 Z4 is the tinny clanging sound the doors make on closing. Again, I was able to close mine without that god awful noise.
As I say, bear with me but if you get it right you lose the annoying noise