n0 > they have to be open to a lot of criticism. .. There is zero reason anybody should mind teachers getting paid more.
They should be, given the importance of their job. Nuclear plants have a lot of oversight, and so should teachers who affect young neshomos. I am not sure though whether we use right tools for the criticism – meeting teachers twice a year and expressing displeasure with end product would be frustrating for everyone involved. There are lots of tools that could be used: standardized tests with published results, student evaluations, glass doors with occasional parent accees, easier ways to switch between classes, more competition, paying good teachers more ….