T.L.
As a previous teacher myself I would caution you to believe all that you hear. Each childs' experience with a specific is uniqueky different. There are a lot of factors that create the atomsphere of a classroom ~ size, student makeup, personalitieis of the students as well as the parents. It is not always the teacher but a combonation of all these factors. I have has some great classes and some poor classes.
On a parent note, my 2 school age children have had wonderful experiences with some of the "unfavored" teachers, I had a son who was a bad fit for a particular classroom this past year. I knew it going into but did not clue him. His behavior and opinions needed to be objective for him to succeed. I did have him moved mid-November to a different teacher but at that time I had "proof" for lack of a better word that the classroom was a bad fit. ANd the move was his choice as well as mine!