It's funny, that with as much experience I have as both a professor and a student, I have never experienced this caricature you are describing concerning Literature courses. I've heard people repeat it, but I've never seen it.
"Every argument is acceptable" I've never even heard a student say this, much less an educator. It goes against almost everything we believe in from a pedagogical level. The entire point of the writing and analytical reading process is to analyze the validity and strength of arguments.
I'm sorry that you got such a terrible education, wherever it was. I would say that maybe my experiences have been skewed because I graduated from, and have taught at top 5-10 universities, but I have also taught at community and state colleges and I still haven't seen what you are describing.
This. It's quite a weak characterisation on panamaican's part. English taught at the top colleges and universities is thoroughly legitimate. Indeed, I would say many of the 'Liberal Arts' are extremely well developed and fairly assessed even if they turn out to be of little use in the job market. Admission to an English degree at Cambridge, for example, is not easy to achieve and neither is graduation with a First or even 2:1 qualification. I am also inclined to agree with you on your criticism of Uchi Mata's 4 points and have noticed the very same trends on these boards.