Netflix allows you to turn of the subtitles in the UI. I have highlighted the relevant button in this screen shot (http://i.imgur.com/2jnxTJJ.png). This is from the Danish netflix.
Unfortunately they do not allow you to turn on English subtitles, and their translation is incredibly poor.
No, you can't. For certain english-language shows, the walking dead is an example, you can only choose between native regional language subtitles with that menu - there is no off option!
Unfortunately they do not allow you to turn on English subtitles, and their translation is incredibly poor.