Learning Perl isn't value-less, but it doesn't compare on any scale to trying "to acquire the understanding" of Huck Finn.
Would it be fair to ask you to prove your understanding and appreciation of Bob Marley by asking you to write an essay on him and then judge that essay based on whether it's contents matched up with what other people before you have said? It doesn't seem like that would help you understand if you didn't. It also takes away your own authority on whether your appreciation of the work is valid, which isn't educational at all.
I think your comment highlights the fact that it's normal to not "get" everything, too. That's something that seems to be disregarded in the curriculum, where everyone is supposed to get everything equally at the same time. If someone were to tell you their favorite albums were Kind of Blue, A Love Supreme, Legend, Pet Sounds, Thriller, Dark Side of The Moon, and Revolver, you wouldn't consider them a paragon of refinement so much as a liar. And yet, we're expecting something like that out of students by testing them this way.
I agree about acquired tastes; I've had a few myself. But people run away when something's pushed on them too harshly. Sometimes the cool assignments are the ones with a list of options (say, choose two from this list). It's an independent choice but still related to the material.