I can agree with the other points you made, but not this one as it stands. If you had added " diesel Vectras and other diesels", then I would agree*. This assumes you are talking about reliability, but I also have no complaints about comfort or drivability.
I have driven six manual petrol Vectras over nearly 30 years ( including the A model which was a Vectra outside UK / Cavalier in UK) covering very great total distances, and the only break-down or non-standard repairs have been one water-pump, one hydraulic strut for the hatch, two suspension-springs and a corroded earth for the petrol-pump that stopped everything - very fortunately at home. I did wreck a gearbox, but that was my fault for repeatedly driving a trailer loaded with 500 kg of sand/ballast up a 1 000m mountain.
I have limited my choice to either Ford or GM models because of their price/availability and design policy i.e. they are not ( generally ) seeking to be first-movers with new cutting-edge technology. In the same vein I would never buy
any new model within three years of its initial introduction because I am wary of unproven developments e.g. the dual-mass flywheel or VW DSG gearbox where problems often do not manifest themselves until 40 000+ miles.
It astonishes me that this kind of major fault still happens: the amount of testing that is done must throw up so many examples of this that the fault is well documented and the reputational damage apparent, and yet it goes ahead.
* This is obviously just my opinion and -perhaps - contentious, but for the past 15 years or so, I have felt that the emissions technology added has made the diesel engine much more expensive to maintain and completely unsuitable for many peoples' life-styles.