It is SOOOO much harder and a hell of a 'lot' more expensive to repair, and to keep rust away, than to spend a day DIY'ing and replacing/re-sealing the vents permanently. Then speak to me about the Auto transmission faults as well as the very expensive 'Start error' faults in the mercedes not to mention all the electrical faults, no way is it better, I know I been there.
I virtually ran the Mercedes V Class helpline over there at the forums for 10 years with my role as is here, and despite selling and leaving forum, I still get emails for help!
As for water leaks, try the rotting roof that lets water down pillars into the cabin and collects in box sections in big puddles under the rear doors, sloshing side to side whilst driving, running along floor into the electrics- untold problems, not good, not good at all Pal
Merc engine better? I agree some that are looked after can well do high mileages but so can A2's do the same mileages, the leaking injector issues that cause black tar of death is a big issue too on their diesels.
Sarge