I'm a first-year Aeronautics and I come from a fairly small town, so going to live in a city as large as London would always induce a bit of a culture shock. However, some of the things I have seen are truly incredible.
First off, there are people who live in the library and only go back home on weekends. This is possible as the library is open 24 hours a day. You should also bear in mind that I first noticed this not during the exam season but in during the very first week!
On my course, there are barely 30 students which have a "home" status - with the other 70 being EU/Overseas. With a great deal of the student intake paying the maximum fee of ~£25,000 per year, what sort of mentality do you expect? It is a fact that most of these £25,000 fee payers are from Asia and they come from an extremely privileged background. Their general behaviour is rude, arrogant and obnoxious. The stereotype which you have heard so frequently of Asian groups bunching together and talking loudly during lectures is certainly true from what I've seen. I'd hazard a guess that the 18% drop-out rate for the first-year mentioned earlier in this thread consists of many of these Asians. They came here because they just want to have the student experience (all my friends are going to uni...) and £25,000 per year is just a drop in the ocean. The average standard of these students are so, so, so much lower than the home students. Forget what you read in the newspaper about the dropping of standard of A-Level students heading to uni...it's those taking the IB and various Diplomas you need to be worrying about. These students are simply cash cows for the uni. It's far easier to get into Imperial as an overseas student as they won't shy at your offer of £25k. A few overseas students failed to meet their offer but they were still accepted onto the course this year. Contrast this to a thread I saw on TSR about a home student failing to meet their offer by 1 UMS for Aeronautics at Imperial but still getting rejected...I wonder why. This is compared to a few home students who I've met, who are passionate about the subject and some have had to come here on grants because they struggle to afford the costs of living in London.
Generally, the younger generation of lecturers are of a reasonable standard and put effort into their lecture notes and tutorial sheets. This is probably because they still remember the hardships of being a student themselves. However, the older lecturers couldn't give a toss. Imperial has an annual "Lecturer Awards" ceremony where each department nominates a lecturer who has excelled in innovative teaching. A lecturer from our department was unanimously viewed as the worst lecturer amongst students but was still chosen to be our nomination. Why did this happen? I'll tell you why. It's a lavish ego-boosting pat-on-the back sort of thing - like the Oscars. Look at us, we're so good at lecturing because...guess what...we said so!