Look at this, an entire op-ed about substitute teachers:
Her basic message is that substitutes are not trained properly, are given obtuse plans, and are often uninformed about needs of the students in classrooms. She is concerned about absenteeism among teachers and feels substitute teachers are poor replacements for actual teacher.
I'm sure what she says if often true, but as a sub, I have also seen a different view as well. In the district I work in, I usually have strong, clear lesson plans left for me which include seating charts in middle and high school. It is always best to have the regular teacher in the classroom, but when they have to have a sub, I consider it my duty to enhance the student's education. Perhaps it means I wander and help with one-on-one tutoring for students who are struggling, something a regular teacher may not always have time for. When I'm explaining math, writing, history, science, I believe I bring another way of presenting information that might be useful or more engaging to some of the students. I try to use my strengths to build student knowledge or their interest in the subject matter. I always follow the lesson plans left for me, but bring what I know and who I am to what we are doing.
And, I work to build relationships with teachers so that by coming back again and again to the same classrooms I can also build relationships with students.
So while I understand Ms. Bucior's concerns about the state of substitute teaching, I don't choose to live it.