On the Structural Differences of the UK and US Systems of Higher Education
roymurdock.com
roymurdock.com
Sometimes this happened for the entire class grade, other times it just happened with tests.
In my general experience, a 70% was a pretty good score. Most profs aimed to have tests hard enough that 80% was around the top anyone got.
All that said, having everything rely on final exams seems foolish. Computer Science is mostly taught through projects, I feel as though my upper level courses had exams more as a matter of "well I think we are supposed to have tests, so, umm, here we go" than anything else.
Not to mention finals lead to cramming, which lead to horrible retention of material. Small cumulative exams spaced throughout the quarter/semester lead to much better recollection of material overall.
Edit: As for cheating, well....
I only ever cheated in one course, and only then because the material was horribly unfair and the professor was terrible at teaching. Cheating in this case consisted of putting material that we were expected to rote memorize (!!) on to my calculator. (For reference, it was chemistry class, before that class I used to really like chemistry... :( )
Asides from that? I think everyone knows of the student who seomehow got through even a hard program (such as CS!) without really doing his or her fair share, but from what I noticed (although I am pretty oblivious) cheating wasn't all that common.
In regards to grades, they mattered far less once I was in my department. :) (Thankfully!)
That said — in my experience — the course work that UK universities that's much less susceptible to cheating in general than some stuff I've seen from US universities. Work varies more year-on-year, and the kind of work involved are things like essays, projects, etc that are harder to copy in a sensible way. I don't think I did a single multiple choice test in my whole degree.
He's spot on about the difference in expectation on top grades though. I've had some… interesting… chats with US students in the past when they went from all "A"s at their US institution to 70-80% at UK ones. Not so much because their answers were wrong — but because they're answers weren't 'excellent'. It seemed to cause an enormous amount of stress for them!