For some reason, many students fear that our student teachers do not know the material they are teaching. This is completely wrong. We're not going to have someone only a few years older than us teaching AP Biology. The coursework that student teachers are allowed to teach is the equivalent of 2+2=4 to them. They have gone through college and even grad school. They may not be as used to teaching the material, but they just took years of classes on the subject.
The highest level class I ever had a student teacher in was Honors Sophomore English, and I'm pretty sure my classmates will agree that she was awesome. Shout out to you, Ms. Olano. You made All Quiet on the Western Front and Animal Farm tolerable. I doubt many others could do that.
It may feel like you were cheated out of that awesome teacher everyone always talks about, and I agree that it can be annoying. But treat it like you are getting an entirely new teacher. Can you imagine teaching the same things over and over and over again for decades? It would get kind of boring, right? Enter Fresh Faced Eager Student Teacher from classroom door right. They are filled with new ideas, new methods of teaching, and are more able to connect with high school students.
Keep in mind that we need to train people to teach somehow. As someone who aspires to teach high school music someday, I have nightmares where I walk into a band room on the first day of school... And I have no idea what to do. Would we send firemen into the field without exposing them to a fire? Would we just throw police officers into a high speed chase without first sending them through the Police Academy? These people need hands on training. Everyone does. Nobody is perfect at something the first time they try to do it.
There can be a downside to giving an inexperienced teacher complete control of the classroom. It’s true, there are some who do not know what they are doing and just read off of a Power Point. But they are just scared of being judged by the students, the same way we are scared of being judged by each other. That is completely valid and understandable.
Enjoy them while they last; you know deep in your heart that by the beginning of next year, you'll be begging them on their Facebook page to come back and teach your class.