The whole idea that you can't follow the action while reading is ludicrous. Tell Quentin Tarantino that, who subtitled half (at least) of his latest film. Or, you could just tell it to George Lucas, who subtitled one of the defining moments of Star Wars (Han shoots Greedo).
The dumbing down of the prequels - i.e. everybody speaks English dialects - is one of the most annoying things for me. I think Magnoliafan was right to just change it to an alien language. One of the cool things about the original Star Wars trilogy was how people understood several languages, with or without droid help. Whereas in the PT they only need to understand bad accents.