I don't think you'd see any quality issues with Puebla. They have been building cars there forever, and it's a state of the art facility.
My 09 Jetta Sportwagen (really a Golf wagon) is built there and seems fine.
Most of the assembly is done by robots anyway. I would guess that a robot in Wolfsburg operated by an Eastern European immigrant is going to work the same as a robot operated by a Mexican in Puebla. After all both robots are probably running software built in Germany by Germans.
This is also the #1 plant in North American auto production, two years running: