<p>I have heard that the actual course material is very difficult.</p>
<p>But the difficulty depends tremendously on who is teaching the course (this applies to any class, really). One professor can decide to make the exams really easy. Another professor might decide to make the exams really hard.</p>
<p>The average grade is a B-. The most common grade is a B (the average tends to be dragged down by people who fail).
Slightly less than 20% of people get an A+ or an A.</p>