Whilst I'm all in favour of getting rid of hopeless teachers, the problem we have is that teachers are being pressurised by their schools, their training and Ofsted themselves to adopt teaching methods that would be considered barking mad by any intelligent outsider.
Bright parents (and pupils) just laugh at nonsense such as 'peer reviews', 'question grading', 'market place activities' and all the other bizarre things that we are encouraged to waste the pupils' time with. However these practices get you lots of praise from those whom you must answer to, so what should a poor teacher do?
There is also a move to allow parents to come into lessons to see how the teacher performs. I think that many parents should be forced to attend school to see how poorly their own child behaves.