Year 1 - fantastic time, lots of work, lots of drink, little sleep.
Year 2 - depression
Year 3 - recovery, and an all right year
Year 4 - enjoying it a lot so far, working more then my parents most weeks, but still finding time to have fun.
Going to be applying for another 3/4 years soon, so can't be doing too bad.
Uni offers you bags of opportunity, it is what you make of it.
I've met so many great people, discovered snow sports, travelled a fair bit, and learnt a lot about myself. Ontop of learning all the cool academic stuff.
My one advice to people is to keep busy. Always. As I look back I find that 'free time' is simply wasted. Get involved with sports, societies, even extra work, and fill you're calendar to the brim. Make the most of it