Indeed. My first viewing of Das Boot was with the subtitles, the second with dubbed in English - totally emasculated the film. There's something about Germans barking out orders in the Mother Language that does add to the experience.
I started watching the English dubbed version once. It was so bad I turned it off. Not only do you lose the sound of the original German dialog but they also chopped out all the ambient sounds so the vibe is completely wrong. One of these days I”ll watch the subtitled version all the way through.