American undergraduate classes are typically easier in my experience,. At the universities I went to (University of Washington and KTH) the Swedish undergraduate classes were more like the graduate classes in my experience. When I say 60+ hours a week I mean it. Who in their right mind works that much and gets a second job? And even if you could that doesn't mean that most people can.

As an example: in the engineering programs of KTH, typically half of the students don't make it through the first year. Many classes has a 70%+ failure rate.