I am going to be a bit controversial here and wonder if the decrease in quality of groundschool instruction has to do with more and more PPL students doing their licences in the US being taught by FAA rated pilots who have never even sat the JAA PPL exams, and who a lot of them cant actually use a CRP themselves? I dont mean this as an insult its just not something thats covered in the FAA syllabus in much detail and therefore they need not know it. I certainly could have benefited from better PPL groundschool for Nav and Met, but my FAA instructor was not familiar with much of the Nav and MEt questions in the confuser.