Art highlights the elitism of opinion So it's not so much that Hamlet can't provide any learning, it's that, if it does, such learning is difficult to measure, may well be subjectively better for some people than others and is of an indefinable sort. How then can one be so sure that Hamlet is definitely better at this sybilline task than any other story? — Isaac
The fact that it's been remembered and celebrated for centuries is evidence, if not absolute proof, that it's better than most at whatever it does. Whether it's better in a particular context depends on the story it's being compared to, what's supposed to be being learned, and who is doing the learning. As in most cases, when you say A is better than B, it's advisable to qualify your statement. A is better than B, for what? for who? In what context? Some people will be immediately turned off Hamlet because of the difficulty of understanding the antiquated language. Some people just don't like plays. The plot may confuse or bore others. And if a work of art can't engage you, it probably can't teach you much.
On the other hand, this doesn't mean there are no criteria under which the potential for learning can be examined or under which to make aesthetic judgements. Basic grammar standards along with style manuals can guide judgements on how badly or well books are written. Colour theory helps inform criticism of painting. Plots have structures that can be analysed and evaluated etc.
Re the latter, for example, here's a plot for a short story:
A woman joins a philosophy forum, makes a post and then drinks a cup of tea and goes to bed. The next morning she wakes up and goes to work. When she's finished work, she comes home and has her dinner. She then goes to bed again.
Not very good, is it? Why? Well, for a start it's not structured in such a way as to engage the reader (it's not even in the genre of narrative, so there's an argument it's not even a story rather than just a recount of events). There's no suspense. Nothing of interest happens. To most people, this general point would be obvious. But some (I don't mean you btw) will insist on arguing the false dilemma that because there can be no absolutely objective criteria re judging art, anything goes, and there's no way to say any one piece of art has more value than another or to claim something as art and something as not, which is a tiresome and boring position to take that suggests not much more than said person knows nothing about art or art theory, and instead of learning something about it would rather do other things such as spend time watching shit movies and resenting anyone who doesn't, or making arguments that aren't really arguments but are just complaints, and generally employ the pretence of intelligence to dig a hole under common sense into which they hope to drag everyone else into. To which I respond, if it's elitist not to join them in their bunkers, I'll gladly don the mantel.