I have the Primastar, and so far it has given mostly trouble free motoring, getting up for 40,000 miles now.
You have to bear in mind that there are ten's of thousands of these vans on the road, do you really think that every one is going to have doors falling off or gearboxes failing? Or even a majority of them?
Of course not, most are going to provide mostly trouble free motoring, not all with suffer gearbox failure after 40,000 miles.
Vans traditionally have a hard life, no matter the make or model you have, they will all have problems at some point, some, even though you may lavish no end of loving, gentle care on them will cost you thousands.
You love Trannie's? Great, but I think they look crap! You hate the look of the traffic/vivaro/primastar? Great, but I think they look great
When I get a van in todays world I don't want just a simple workhorse, I expect an awful lot more, I expect it to drive like a car, I expect it to have a decent sound system, a comfortable cab, huge service intervals, I don't want a box on wheels and I also expect it to be able to deal with the demands my particular job puts on it.
To get all this takes lots of fancy engineering and with all of this fancy engineering comes an awful lot more things that might go wrong.
20 years ago, if I had a problem or a breakdown in my car or van I'd strip it down and rebuild it myself! Nowadays you need a degree in engineering to remove a hubcap!!
No matter the van you get, you may well get a load of expensive problems...you pays your money....
Ian