I don't believe there are any serious criteria for assessing this. Some countries are better than others at certain things. Certainly, the US is the freest country in the world; it has a wonderful legal system; and has the most military forces in the world. But the US also has the worst educational system (despite its many colleges and universities) and does not offer healthcare to many of its citizens. Taxes are high and the gap between rich and poor is very wide. Some countries have great societies or a rich history. The US does not have these things. I'm always curious to know why Americans like to say their nation is so great. We may be powerful, but what has power ever done for me? Nationalistic pride is a dangerous thing. I think we should always find ways to critique and improve our nation. We should never sit contentedly on our molehill and gloat with self-satisfaction, convincing ourselves that we are wonderful. Where is the philosophy in that? We should always probe, always question, and always be curious.