Not that many people take the piss out of Land Economy actually here at Cambridge; it seems more of a TSR thing.
It is a demanding course from what I have seen - one of my best friends is a Land Ec and her workload is similar to that of most Cambridge students. In the first year they study five subjects - Public Law, Economics (Macro, Micro and Welfare), Geography, Accounting and Statistics. It isn't a "doss" subject and from all I have seen it is very academically rigorous.
Apparently Land Economy graduates have the highest employment rates of all Cambridge students, and the majority seem to get damn good jobs in the city or do law conversion courses.
HCD didn't even get into Cambridge, and clearly hasn't spent 2 minutes researching the course.