I think that's just what we tell ourselves to feel better and for national pride. I started watching movies in English many years ago and, even when my English was not yet very good and I had to use subtitles, I preferred watching the original version, the real actor is just much better. Now, after living in the US for a few years, when I hear dubbed movies they sound just ridiculous: everyone speaks with the same flat intonation, there is no emotion in the words, it all sounds fake and, funny detail, I'm now much more aware that the voice is out of sync with the lips. It's both hilarious and painful to endure.