I couldn't care less who is in the movies I watch. Obviously I have a few favourite actors, but I prefer to see performances from unknown actors, they all need a chance and there is usually some great tallent waiting to be found.
Even so, Persian or otherwise? I couldn't care less. As long as these people can act and play the part well, who really cares? Jake Gyllenhall was great as the prince, the film itself wasn't great buy hey that's not his fault.
So I can see both sides of the argument here and it isn't one that particularly bothers me.