Having had a double din Kenwood in my last car and used the basic VW model in my son's old car; both had FULL integration with FULL control, album art etc etc. MB's iPod and iPhone integration is woefully lacking or very cumbersome or non intuitive at best.
New A-class integration is half hearted and the Comand NTG2.5 is barely okay. When every, and I mean every, other car maker seems to have this off pat, MB are still plodding along. The only car maker I encountered that was worse than MB was Saab.
Very disappointing for a company that advertises 'we were the first to...' in their dealerships. Sorry to all. Rant over.