Radio/tape Cd Player problems of the 2003 Mercedes Benz E320

Problem #1). The interior driver and passenger door handles have a chrome tape of some type that covers the handles. This tape overtime comes off on the inside and it is extremely sharp like a razor. I cut my finger twice on the driver-side and a passenger got cut on the passenger side a year later. I contacted mercedes about this and they wouldn't do or offer anything. Problem #2). The driver and passenger sun visors overtime get very very stiff and will not go back all the way up. My wife can not even move them at all. I also verbally reported these problems to penske mercedes in west covina, CA to my service writer and he stated "yes we are aware as it is a common problem however there is no recall on those items". He wanted to charge me $275 for each sun visor to be replaced and that did not include labor to install them. Problem #3). Lower ball joints go out quite frequently and is also a "known common problem".