I’ve been a huge fan of the business thinker Seth Godin. I voraciously read his books and his blog.
You can find Seth’s post on what he learned from lousy teachers here: http://sethgodin.typepad.com/seths_blog/2010/03/what-you-can-learn-from-a-lousy-teacher.html
I just hope, I wasn’t a lousy teacher and hope I will never be one either. However, its good to know you can even learn from lousy teachers.