The Jetta was everything promised. With 7,000 miles on it, I've averaged 43 mpg in the city. It's fuel efficient, yet it has get-up-and-go when it needs it. The fuel gauge is more conservative than published in the owners manual. I've been very satisfied.
TDI is cool. It seems put together very well.
One problem is the inability to dim headlights, and there is a minor issue with wrist jewelry scratching the rear doors based on handle placement. It seems a lot of the other improvements will be incorporated in the '06.