I just figured out why the Obama speech in Berlin to adoring throngs was such a puzzle: It was like a dog walking on its hind legs. As Samuel Johnson said, "It is never done well, but you are surprised that it can be done at all."
No speech would be satisfactory because of the singular circumstances pertaining to its being done at all. No criteria exist for judging what was called for. But it's fun to watch a dog walking on its hind legs.