Passats have more problems than Hondas, Toyotas, Mazdas and Ford Fusion. Initially these would not be expensive, since all Volkwagens have a good warranty. Most VW owners sell them when the warranty is up.
As they age these cars cost a great deal more to repair than comperable US and most Japanese cars. They also require special oil (more expensive) and you have to make sure the car gets that oil. Stay away from fast oil change places.
If, after this, you still want one, compare it with hooking up with someone who has “special needs”. It just requires dedication.