gehenna:zaptor: Then again, in Finland those "who can" actually teach (as where we tend to be the reverse).
Generalisation.
The argument that the (NZ) teaching profession is basically a tax payer funded employment service is not a new one.
Unfortunately, the relatively few really good teachers aren't enough to make up for the rest. If you want an example of total utter incompetency look no further than our public education system. I agree. It's unfair to tar every teacher with the same brush. But, when you have a system which basically protects the lowest common denominator (not even mentioning the predators), it's not hard to understand why good teachers either give up or eventually metamorphosize into mediocre (at best).
As for Finnish school teachers. I don't think it's a generalization to say they are arguably the best in the world.