My worst experience with a teacher in my 4th semester of college it was a programming class and the guy would just give us the projects, already completed, he sent the files to our email and told us "learn that" and that was it, eventually the day of the quiz or exam came and you had to explain your way through things, it was basically a self-learning class  but he was supposed to be teaching it... Instead he just gave the students the solutions and told us to learn from that... when the whole point of programming is to learn problem solving, whats the point of just getting the answer and studying it?