On the long hauls, they are very similar for service. On domestic flights, it's different. For USA passengers flying that 1 1/2 hour flight that were paying $150 for, we don't expect trans-atlantic first class service, because for flying, $150 dollars isn't that much. Also, in the USA, people fly more for a few reasons:
A) The USA and Canada are big countries with spread out populations.
B)With the vast land, family is usually 1000-2000 miles away, whereas in Europe, it would be odd to live 200 miles away.
C) People fly more often because to drive from NY to LA, it would take about a week, if not more.
In the USA people fly more often as everything is spread apart whereas in Europe, places are closer together. In the USA, some domestic flights are 5-6 hours, whereas the longest european domestic flights aren't longer than 2 hours.
Therefore, people in the USA fly more frequently and it becomes less of an event, and more of a way of getting to your final destination and somehow, the service has gone down.
I for one wish the service would go up and only the majors(AC,AA,DL,UA) will offer you decent service, especially on the transcons.
Give me a break, I created this username when I was a kid...