For me there's also the issue of writing. If I'm reading/watching something that I want to write fic in, I want the original version, so that I know the characters' voices and can make them sound natural in my own writing. I watched AA with Polish dubbing once (they showed some eps in cinemas!) and it sounded so weird.

Obviously the fun starts when you meet someone from your own country and go "oops, I can't fangirl in my native language" :P