Ogata's performance is not bad but a great performance would be required to carry off such a claustrophobic script. Robert Dawson is clearly not even an actor and seems not to understand his own lines. I assume that the GIs were played by Russian passers by with a cold war grudge.
Like 'Downfall' the narrative has all the potential of Greek Tragedy: human life writ large, where the outcome is not in doubt and a small stage on a human scale is used to chart great events. Unfortunately the task was beyond the writer and director's grasp and far beyond that of the cast.
Some of the Emperor's verbal and physical non-sequiturs are amusing and generate some pathos from his situation but that is as far as it goes.
In the few outdoor scenes the curious visual effects that are obviously meant to add artistic gravitas are as intrusive as the score.
A good film could be made out of this subject matter but this one isn't it.