No, no, no. It does not matter where a car is made. All that matters is the design and the materials specified. If it is a good design and the materials are of the appropriate quality, the vehicle will be exactly the same wherever it is made.
They are all assembled the same way. If the hole is in the right place, then the bolt is too and the part assembles perfectly, every time everywhere. It does not matter if a car is assembled in Germany, the US, Bangladesh, it doesn't matter.
Assemblers do not whittle parts out of blocks of metal or shape sheets of metal. They simply assemble and they are given no choices as to how to do that. The powered wrenches are set for the correct torque, the holes are in the right place and tab A goes into slot A.
If a VW is not as reliable as a Toyota, it is because VW's design is inferior and/or they specified less appropriate materals, alloys, etc.
If you switched employees from one plant to another the results would be exactly the same.
What is variable is the price they charge for the car, its replacement parts and to service it. If Brand A is more reliable, the replacement parts are less and the service costs are less, then Brand B will obviously suffer by comparison.
And, as we all know, the badge on the car has a lot to do with its price and cost to own, even if all else is equal.