Just read Colm's post about Hapag-Lloyd Express.
As someone with a fear of falling (you might call it a fear of heights.. but a fear of falling is more accurate since I'm not afraid of being high up inside a building or on a bridge where there are railings in place to stop me falling off etc.) I will definitely try to avoid this airline.
My scariest experience with an airline was flying into Frankfurt with Lufthansa one time. We almost landed when it hit serious turbulance and the plane dropped quickly. I hate hate hate that feeling.. the tightness in your chest when every instinct in your body is telling you that you are going to die.
I will never fly with an airline like Hapag-Lloyd if they fly in such a scary manner.