See, I just kind of accept the actor's natural voice for what it is most of the time. It doesn't take me out of the film, it actually lets me enjoy the film without going " wow, that is the worst accent I've ever heard " or " his dialect is completely wrong for this " ( see Brad Pitt for reference on both counts. That stupid movie where he was in the IRA, his accent blew ).
Some actors can do accents very well, alot of them cannot. So for simplicities sake, just let me speak normally if they can't do a particular accent. Now for example, when a movie like this is dubbed in spanish, they don't do a Spanish voice with a German accent. No, they dub it in Spanish.
Yes, it is great when they can do it accurately but when they can't just let it be.