Only gone through two years. First year was better by some way out of the two - second year, I kind of lost motivation and missed living on campus to some extent, and the content got more difficult and less interesting for most modules.
My 3rd year, starting this Monday, is a placement year so I think I'll enjoy it a lot, and then 3rd year is probably going to be the best year at uni because of the option choices, knowing what I need to get what classification, trying to make the most of uni life while I have it etc.