Just popping onto the thread here. I see people talking about the tensions within a class, and the cliquey/arrogant atmospheres, etc... I can say my class wasn't anything like that, and I'm very grateful for it. I think it had a lot to do with culture. We were always very supportive of each other, sharing resources, making big google docs for studying for finals, lots of questions and discussion on our facebook group. No one talked about grades beyond pass/fail. You suspected certain people of being the "good grades" people, but no one was really sure. Certain classmates always had really thorough, helpful answers to questions, and so they (we - I guess I was one of them) were known as "most likely getting the highest grades" but also "people to ask for trustworthy answers."
It's interesting to see that you encountered a similar kind of thing in Scotland vs when you transferred. I've always been suspicious that the highly competitive US schools have a more unpleasant environment, and the student culture at my school was one of the biggest advantages of having gone to NZ. I mean, I've heard horror stories from vets and transfer students, about the competition and every-man-for-himself culture. But I definitely agree with everyone saying each class is unique. That was so true for our school. The class below me had a way different personality than our class. There was also a class with an elitist group of post-grads who'd all done masters and things, and wouldn't really give anyone else the time of day. So I wonder if it's just luck of the draw, how "nice" of a class you end up with.