While America is no doubt a great country, whether it's the greatest of all or not is something to be left to the judgments of history. What I like about America, amongst other things, are the following:
(1) Most Americans are honest, decent people: you can't find many places in the world where you can just leave your school bags unattended before you enter a bookstore.
(2) It has a high level of volunteerism and it devotes a decent portion of its GDP to charity.
(3) It has the courage to face up past wrongs, such as slavery and incarceration of the Japanese Americans. I don't want to bash Japan, but it's no secret that Japan is doing everything to cover up its WWII crimes by rewriting its textbooks. And it is not upfront about its war atrocities--biological experiments done on live humans in China and Southeast Asia, sex slaves for the pleasures of the Japanese soldiers, etc.
What is wrong with America:
(1) It keeps riding its moral highhorse unabashedly. There is nothing (much) to learn from the rest of the world; the rest of the world has much to learn from us. But is that true? Think about the disintegration of the family here: 50% divorce rate, the highest in the world, and it's got the highest murder rate amongst all the industrialized nations. Shouldn't that cause us to think deeper?
(2) Freedom is the heart and soul of this country, but perhaps we are giving it too much license. There aren't many countries in the world that would let school kids go on a shooting rampage-- the likes of Columbine. (Let's not use Rwanda as a counterexample. Let's talk about developed and even nearly industrialized nations.) Moreover, freedom is not equal for all. If you are black and you want to buy a house, the real estate agent isn't likely to want to show you what's available in a white neighborhood. Whites just don't want blacks to move into their neighborhood because they are afraid they will push down the resale value of their homes. These are the hard realities.
Didn't the Sunday School you went to taught you something like this: "If you have a log in your eye, don't try to remove the speck in your brother's eye?" For all its greatness, America needs to learn from others just as much as others have to learn from her. Bombing other countries may only give us a break for now; eventually, it only creates more problems, much harder to deal with down the road.