From my personal experience and what I’ve heard from other people your satisfaction at the LSE will greatly vary depending on the department. My own is very small and very proactive in providing us support and contact with teachers and academics, fostering a lovely community which I feel very comfortable in. But many of my friends in larger departments don’t feel this way, and I’ve heard many stories of over-work and loneliness. The corporate environment is also very taxing, even if you have no involvement in it. I would recommend finding creative societies to balance all that out!