Most of the problems were related to the electrical system, e.g. passenger seat motors and passenger seat airbag sensors.
Replaced rear corner plastic trim (cracked).
Replaced read brake pads and rotors at 16000 miles. This seems to be typical for the V8 ML.
The V8 has effortless power.
Cabin is a very comfortable place to be in.
Bose radio sounds great and has tremendous bass.
Truck is great on the beach and for the light off-roading I've tried so far.
Road-holding is very good for an SUV.
Safety features unrivaled.
Good space for 4-5 people and lots of luggage space.
Navigation system is wonderful!
Yes, quality has steadily improved from poor to not quite so poor - but still poor none the less. Even with 2003 models there are still well known issues which should have been addressed during the first year of production.
Mercedes ML430 still has some features to improve to satisfy its Mercedes fans. However, there are Mercedes ML430 parts - http://www.mbpartswarehouse.com/mercedes_ml430parts.html available in the net for replacements and additional accessories...