All my students need to be stellar is a good Berkeley T.A. I am one such except that I have lost a key property of the official T.A. from back in the day: we were responsible for only 17-34 students, and we were paid for 20 hours which were dedicated to those particular students. Since I have so many more students, I have lost my most important characteristic; I am no longer as good a T.A. as I was at one time.
Axé.
coldhearted scientist وداد 
Most of my teaching has been at that lowest level, which was quite suitable for an undistinguished student like me with only an M.A.