Interesting. TLDR: Harvard undergrads walking out of Mankiw's Intro to Econ class (Economics 10), because he only intro's his area of Econ, rather than a broad survey of all its major schools of thought.

For anyone not familiar with Mankiw's positions, as I was, Wikipedia is a good place to start:

http://en.wikipedia.org/wiki/N._Gregory_Mankiw