This class was hands-down one of the most fascinating I have taken at Columbia. Professor Sachs is one of the most organized, engaging (at 8:45 a.m. too), passionate professors I have had. He uses slides for every lecture that truly supplement and illustrate the material he is discussing. He covers every conceivable topic in sustainable development, and it is obvious that he genuinely wants students to understand and appreciate the extent of the problems of poverty.
He has a great lecture style, and even in a class of 200 + students at 9 a.m., was willing to ask questions to the class and joke with us instead of simply lecturing AT us.
This class was so informative, and the T.A.s did a great job of keeping everyone up to pace with some of the trickier concepts.
There really isn't anything I can think of that I found problematic with the course.
You end the semester with a whole set of tools to conquer so many of the problems of developing countries.