Equally group work, online investigations and problem-solving activities are good and definitely have their place in the teaching of maths ...
The great schooling divide: why we'll never see eye to eye on educational issues
Education ought to be responsive to change. Methods that worked in classrooms fifteen years ago should not be expected to work with today’s students – at least not as well. They might be used to provide some variety from time to time, but not five days a week, six hours a day.