Calling a show a 'guilty pleasure' is like saying 'I'm embarrassed to say I watch it but I can't stop. ' That's not a compliment.
It makes little sense to spend a month teaching decimal fractions to fourth-grade pupils when they can be taught in a week, and better understood and retained, by sixth-grade students. Child-centeredness does not mean lack of rigor or standards; it does mean finding the best match between curricula and children's developing interests and abilities.