I our elementary schools, no one reads those letters, they are placed in a folder still sealed in your child's files,.
The teachers literally spend days sitting down and discussing each students, strengths and weaknesses. Also the best personality to match that child for homeroom. Then the child is placed in most academic level classes based on their abilities and learning level for language arts and math. Yes, even in 2nd grade, they switch classes for these 2 subjects.
There atre no "best teachers" they are teachers that are all diffrerent and their classesa re made up to match and even out the pol;ulation of learning levels.
I learned a long time ago to trust the teachers. I was very concerned about a certain teacher. After our daughter left that school I asked her who her favorite teacher was.. She told me, "I had a lot of favorite teachers, but the teacher I learned the most from was, Mrs. F..." Yes, she is the teacher that most parents try to get their children out of her class, because she is tough and pretty no nonsense.. But she is obviously is an excellent teacher, just not great around parents.