Well, I've actually been to one (in Frankfurt), and it was pretty good iirc, though they did offer certain ingredient combinations that one often encounters in the German Italian restaurants and might seem odd to the American eye. This isn't necessarily a bad thing, as it suits the "national palate." On a broader note, take Joe H's advice and lay off German food- I've had some of the best meals of my life in Germany and Austria (which I would argue has a completely separate cuisine even if it gets lumped in with d-land a lot of time).