good:

• fun
• passionate
• uses stories from their personal life to explain concepts
• very clear about homework, exam, etc.
• organized resources
• optional resources for additional learning/practice
• always includes students in the teaching (e.g. lets them read) but doesn't force it
• info about exam structure in lesson 1
• uploads powerpoints at the start of the lesson
• always laughing, doesn't feel like a lecture but more like a conversation
• pop culture references, tv show clips, etc
• puts all the resources online from the start and says exactly what students have to do the whole semester
• doesn't just speak themselves, lets students speak and explain things

bad:

• awkward silences, e.g. during youtube ads
• typing during class
• not repeating the question when nobody answers (they might not have heard it)
• saying the same joke twice
• shows too many youtube videos
• youtube ads / autoplay
• too much text on powerpoint
• ugly/boring powerpoint
• abstract concepts without examples
• thinks they're always smarter than the students
• never sees when someone is raising a hand
• takes days to send what the homework even is
• guilt-trips students about how stressed they are
• uses difficult words and assumes that everyone knows the meaning