The other side of that coin is you don't see any cadets on here saying how good it is either.
If they're happy with the course is there really a reason to go on here and discuss it? People are far more likely to go online to complain than they are to praise. They're probably getting on with their careers at J*.
As a matter of fact I did come across someone on here about 2 years ago who was in the middle of completing the course and was answering questions. He hadn't experienced any significant problems with it at all.