Atmosphere on set
Usually an actor's voice is recorded directly on set, and it's a big difference whether someone says someone in a factory hall (e.g. in the final scene of The Departed) or on a beach or in a forest. A resonating echo, the sound of breaking waves or the creaking of the undergrowth are an inherent part of an actor's performance and of the atmosphere which makes many movies what they are.In a dubbed movie, on the other hand, you can easily hear that the voice actors are sitting in a studio. The result is an audio track that's completely flat, lacking any kind of atmosphere. Sometimes it's even just words that create an atmosphere, for example the conversation between Death and Max von Sydow in Ingmar Bergman's The Seventh Seal: 'Vem är du?' - 'Jag är döden.' - 'Kommer du för att hämta mig?' ('Who are you?' - 'I am Death.' - 'Are you coming to get me?')
The Seventh Seal