It all depends on what the criteria is.
For example, in terms of military strength, no other country even comes close.
In terms of our K-12 education, we are mediocre.
Our universities though are some of the best in the world.
We have one of the highest per-capita GDPs, but we also have a higher poverty rate than our peer nations.
Our murder rate is much higher than any of our first world peer countries.
If you have enough money, we have some of the best medical centers in the world with institutions like the Mayo Clinic, MD Anderson, John Hopkins, and the Cleveland Clinic. Our overall health system does not perform as well as many of our peers though, and is more expensive.
In terms of cost of living, we beat many of our peer nations, particularly with housing costs.
In terms of economic mobility, we are unexceptional among our peer nations.
When it comes to IT and innovation, we absolutely kick ass.
All that said, where we really excel more than any other country, other than Canada with its low population density, is in preserving wilderness. For example, only the far north of Europe has any significant true wilderness. Only Siberia has any significant true wilderness in all of Asia. Much of Africa is exploited, and South America is headed that direction.
In contrast, we have over 109 million acres of wilderness in our federal wilderness system alone. There are really just two qualities we have in this country that are truly unique, more guns than people, and we preserve wilderness - protecting vast areas from any development at all, while still allowing full access by citizens to those areas. We all own our public lands, we call can access them any time we want. In the case of wilderness you can spend all the time out there you want with little restriction. You can camp where you want, fish where you want, hunt, climb, whatever you want to do as long as you don't damage it. It's the closest thing to true freedom that you will find anywhere on this earth.
For example, I took this photo deep in the Southern Wind River Range last August on a 5 day off trail solo trip there.
If you were to continue walking along the divide there, you would have to walk almost a 100 miles before you hit a road and even then, it would only be a dirt one. Moreover, your great grandkids will be able to do the same one day. No matter how much modernity impacts the world, this will remain the same. There is nothing more uniquely American than how we have preserved and protected this places and we are probably the greatest in the world at it.