I'm surprised that no one mentioned the great service you can expect from most Chrysler dealers...I know there are exceptions but the majority are not accustomed to servicing "high end" cars.

Other than that:
Audio system not up to industry standard for the segment
No auto dimming mirrors on 05's and later
No telescoping steering wheel
Old tech steering box, this car should have a rack and pinion steering rack
No standard or optional HIDs
Minivan style grille
Typical Mercedes lack of ergonomics...Cruise control stalk, window switches location...
Low grade floormats

and did I mentioned the great resale value...but I would buy it all over again no question about it.