People, in general, are quick to moan when something's wrong.
It's not negative it's just that when something does what it should we don't shout about it.
My toaster-cracking, 4 years of perfect toast, kettle, perfect hot water for 3 years etc.
Think of all the things we use each day that could break. When they don't we don't say anything about them cause there's nothing to report.
When they do we talk about it.
Vivaro/Trafic/Primastar have had some issues to be fair but (from my limited experience) after 2008 the problems seem fewer.
Even the legendary VW's-someone on here had one that was a pup.
Of it isn't brand new (or within the 3 year manufacturers warranty) you take a punt on all vans