Ron Miller is pretty straightforward. His lectures can get quite boring, but they are very factual and useful. Sitting in the auditorium of International Affairs can put you to sleep. He does tend to give decent grades (I thought so anyway). Going to lectures is beneficial, but the class can be passed without them. The midterm and final are a little difficult (especially 'true, false, and uncertain' problems and anything to do with OPEC), but the grades are assigned on a curve fluctuating with B+ as the median.