I haven't seen it, but after having read "The Rape of Nanking" by Iris Chang, I'm both interested in seeing it, and yet hesitant to do so. I don't see how they could portray the true extent of the horror of what happened. It's just too much for cinema. And yet if they don't, they would be "sugar coating" the truth, and not doing it justice.
Also, I'm not sure my Chinese friends would want to go and see it. The subject still stings too much.
By the way, to anyone who hasn't read Iris Chang's account of the event, I wholeheartedly recommend it to you.