>>9626658
There is nothing inherently wrong with YA literature, and it is often enjoyable, certainly. I would give examples from my own youth, such as Harry Potter (that's right), Guardian's of Ga'hoole, Warriors, His Dark Materials, Ink Heart Goosebumps, Animorphs, so on so forth...
But while these YA works can certainly be engaging and entertaining, even beyond one's youth, if you do not eventually evolve past them as a reader, as a thinker, you are doing something wrong.
It strikes me that the issue is not precisely with the literature itself, but rather with the reader. Literature, quality literature, when seriously pursued and engaged, is meant not only to entertain, but also, and equally, to edify. If your tastes in literature are not growing as you do, it is very likely you have not matured as a person. This is generally true of all forms of media. If you are entirely satisfied with the childish, youthful perspectives in YA media, you have not matured.
That, I believe, is the nature of the problem.
All that said, I maintain that there is no shame in enjoying YA literature, with moderation, especially when revisiting or sharing works which you enjoyed in your youth.