Marshdrifter is right on, while some lean towards jingoism, others lean away from it, and still others are "sensibly patriotic" What I mean by that is that most americans realize that while america is a wonderful country to live in, we have our problems and we are not perfect.
I personally am patriotic, I love this country and feel fortunate to have been born and raised here, not because I think any other place would have been worse mind you. I also fought for my country, however after all that is said and done, I know we have our issues like anyone elses and I could never be accused of saying our country is the best, because that is all a subjective matter. It's been great for me!
On the whole 9/11 thing, I dont have any anger for muslims, I served next to muslims, and now work next to muslims, jews, and other various people of different beliefs. I myself hold no religious beliefs. My only frustration is towards those who are too fanatical to see the difference between policy and people.