For what it's worth I have had similar issues with TVR and Bristol.
I firmly believe that it is a "management" issue - insufficient regard placed on inspection and quality control. This is perceived as being expensive, but I am convinced improved (Exhaustive!) pre delivery inspection would save in the long run.
With regard to Simon's comments about missing cars that have been a royal pain in the arse - is it like Stockholm Syndrome??
over the last 20 years I have run all manner of hand built and/or old cars. Every few of years I buy a "New car" and say to myself "never again". Within a couple of weeks I am back on the phone looking for my fix again.