How is the European university system different from the American system?

European students do not receive grades at university, and their tuition is almost always free.
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European students have 2 years of general education, then 2 years studying four different disciplines.
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European students only attend university for 2 years, whereas American students are in college for 4 years.
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European students study in only one discipline area from the time they enter university, rather than beginning with 2 years of general education the way American students do.
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European students study in only one discipline area from the time they enter university, rather than beginning with 2 years of general education the way American students do.