Australian here. There are typically 3 types of American that I've had experience with (direct or indirect)
The government: the general consensus here is that your government thinks the sun shines out of it's ass because you're big and powerful. There are exceptions to this (Obama is pretty well liked here), but the general consensus is that your government has a "america is the best at everything in the world, everyone needs to adapt to be like us" attitude.
People that I've met (the majority): Most of the american people I've met in real life are dead set legends. Most of them are very open minded and easy going, although this could have something to do with them being travelers. I'm a huge fan of american sports, so we instantly bond on that topic alone. They also love to party (again, probably more so because they're in a different country) and are always down for a good time.
People on the internet: This group is a mixed bag. Some of the americans I've encountered, and most of the Americans on these forums, are pretty cool. On some other forums however (and occasionally, in real life) there are Americans that are stubborn, backwards (no, just because it's the second amendment doesn't make the right to bear arms a good law. It's fucking stupid.) and think that the whole world should be Americanized. Again, this is a vocal minority, but it's this minority that gives your country a bad name around the world.