I too have noticed that my glove compartment is not aligned properly. It is not flush with the dash on the left side. However, I have not noticed a rattling sound. I suggest you take it to the dealer and they can probably stop the noise but it might still be out of line. My dealer's service dept. couldn't seem to fix it completely.
The dealer fixed the rattle in my glove box, but it's back. They indicated that they adjusted the "striker plate". Does anyone know how to do this. I don't want to haul it in if I can help it.
Since the glove compartment rattle was the more minor part of Machen's problem, he never really responded with more detail on the glove compartment fix. He did give a service tech contact, though:
My service representative's name was Travis. The technician's name at Sterling McCall is Edward. The number for the service department is (713) 596-2300.
The left side of mine also looks misaligned - but no rattle. I'm going to stop at the dealership and look at the alignment on other MDXs (They have some these days!)