I think there are many facters that make a good teacher. Looking back at my teachers, the things I valued were engagement with students, transparency, easy to contact, helpful and understanding, organized, and clear. It's important to understand that not everyone works or learns at the same speed, so teachers that can accomodate to their students are good. In my experience someone I am afraid of is not a good teacher because it becomes hard to respect and talk to them. If I feel like I am being respected and valued by a teacher I will be more inclined to learn from them.