It really depends on what kind of teachers you're talking about. I've seen good teachers and bad teachers. And I think teachers are a necessary part of education.
Speaking as a teacher's assistant, I've been with 50 or so students per Tuesday and Thursday. There's a trade off that has to be present in order for there to be a successful student. The teacher has to present the material, explain the material, or state the importance of the material enough so that the student outside of that discipline and that education level can understand. For some teachers it can come naturally, for others it can be very difficult, as I've learned from classes on how to teach (creating a lecture for students is extremely hard). The other part of the deal has to come from the student. The teachers I know, as well as myself, offer office hours, help room hours, and recitations to help with material and homework. And while the teacher is responsible for stating that those lifeboats and resources are available for students that are having a hard time, it's up to the student to decide whether or not he or she wants to accept and use those resources. There's a point at which the teacher cannot care more about the student, because then it definitely becomes babysitting.
Do I care about the grades of my students? Absolutely. Do I reach out my hand in offering help? Hell yes. Do the students come to me for help? That depends on them.
The good qualities that I've seen in past teachers are from my Intro to Quantum Mechanics, and Electromagnetism I and II classes:
-A well laid out plan that doesn't extend into overtime.
-Clarity such that the student at that level of education will understand the new material.
-Offers good office hours so that the student can see them.
-A friendly nature and commanding knowledge of the material.
-HW that is on a weekly basis.
The bad qualities I've seen in past teachers come from my History of Jazz class and possibly Intro to Archaeology (although that teacher wasn't so bad.)
-Not enough HW or graded assignments to keep the student invested in the material or learning the material.(HoJ)
-Lectures that seem to ramble on. (HoJ)
-Too much reading, and especially... (ItA)
-Too much reading outside of the textbook (Cosmology and ItA).
-Too fast or too slow on lectures (Cosmology Class).
-Little clarity on the material (Cosmology Class)
Some people have said that teachers are overpaid. To those of you who have said that, here's some food for thought. One of my high school physics teachers left his job to become a plumber because being a plumber had a bigger salary. Elementary through High School teachers don't get a lot of money per year. It's more than enough to keep them in the middle class, but it's definitely not a deal of being overpayed.