My 2 cents:
People here are way too immature and have no appreciation for learning. They are shallow, even if they have great academic skills. I have the feeling they see university as something they should grind throughin order to fulfill their dream of being an employee with a decent salary. There is no spirit of learning, but a very strong one of drinking and being an *******. I don't have problem with drinking per se, but here it has a very childish angle to it - it's like a fascination with something they have been deprived of for so long and now they get to have it.
Having said all that, I've heard it's more or less like that everywhere, even at Oxbridge and the Ivies.
Academically I'm not sure what to say. I've had a module with terrible teaching, another with poor teaching, and a third with great teaching. The students being mostly uninterested or unprepared hurts the tutorial sessions a great deal. I am myself guilty of this. It's very difficult for me to find motivation here.
Overall, ever since I came here, the whole thing feels massively overrated and I wouldn't call myself a brilliant and demanding student.
These are just my impressions though, and you should take them all with a grain of salt, as I'm only a socially inept first year student and they are based on limited data and maybe on prejudice against people in general. Your experience might be quite different.