'badly taught'
I don't think that this necessarily indicates a badly taught FI course, as the course doesn't aim to teach basic aerodynamics. To me, this sort of teaching is representative of someone who didn't learn the basics properly and has got through the rest of the training without revising his/her incorrect base facts. The FI course is more about how to teach rather than dragging you through the whole ATPL syllabus again.
Rather than ranting about the poor standard of FI course instruction, I would look at the JAR PPL and ATPL syllabus and think about how the emphasis has moved from understanding principles to passing exams. I know people who got through the exams by focusing more on exam technique and past papers and less on application of fundamental principles.
My FI(R) course was taught extremely well and I'm getting a bit pissed off with the snotty attitude of some people towards modern FIs. I went through PPL training in 1993 and back then the standard of training was not different. Some are good, some are bad. Some teachers have the bedrock theoretical knowledge and some don't.
God save us from a 'rash of instructors who will be teaching utter rubbish'. Bugger off mate.