Cause they fail more and more often. They have very complex engines. Honda/Toyota have more simple engines which can last easily 200k miles or more. Starting 2017 Honda introduced turbo in their engines, not sure how the statistics will change because of this.
Yes but I'm talking about statistics.. in them, thousands of ppl participates, not only one or two. There is a good reason why Honda/Toyota have higher resale value. Even if vw gives guarantee, you will be in the shop more and waste more time. Finally, there was a time that Passat or Jetta were good looking cars. I think they lost their taste.