I actually found making friends at university easier than expected! I made some really good friends on my course and would say that I'm friendly with everyone on my course, now (end of second year). I also have a few friends on courses we shared lectures with. I never really got into the society side of things but I know people who did and made really good friends that way too. I know some courses are different, but everyone on my course socialises with others on the course outside of university, as well as their other friends. We are pretty cliquey though, but I think that's sort of natural. It's silly to expect 40-100 people to all get on well together.
First year was easier than I expected in terms of workload and course content. Second year was a real step up in expectations, and I think third year will be a step up again.
I did expect to know my lecturers better than I do. Now I'm in second year, I know my regular lecturers pretty well (especially what they're looking for in an essay) but in first year we often had lecturers for just a few sessions in large groups, and I can't even remember all their names.