JJRodger,
Where are you located? Must not be in the US. Yeah, I test drove a C230 before I got my car, and I was like, NO WAY. The thing WOULD NOT move!! So I knew I had to have the C280, good amt of power for me.
I don't hear any rattle unless I turn the bass on the stereo up, which I don't need to do because I have a sub. BUt when I do, then there is some rattle in the front door speakers, but my bass via the MB stereo is always turned low. Other than that, the car is perfect, albeit the passenger door!
I made a mistake also. The door didn't say RODOVE, it said RODOT, with that first 'O' being a MB emblem. Just in case someone knows what that is..

YMSIN,
Yeah, the car is mine for better or worse. I will fix the hollow sound of the door, and hopefully the non-matching panels on the inside. Well they match, they are just not placed right and have a few small cracks. I just have to find some of the sound-deadening material to slap in there. I didn't get around to opening the door up today, but maybe tomorrow, or Monday.

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)