VW Passat a lemon?

It's impossible to say whether or not you have bought a lemon, but I would strongly urge you not to sell it, that would be the wrong thing to do at this stage. If you look on the positive side, VW has repaired the failures that have occurred, so they have backed the vehicle. The downside is that you would not expect a new car to have issues of the sort yours has had, and that's both disappointing and frustrating. But having bought the car, it's best to stick with it.