Not to put too fine a point on it, but you seem unfamiliar with Wilde's work or his stated position on criticism - i.e. that only critical faculty enables any artistic creation at all. https://en.wikipedia.org/wiki/The_Critic_as_Artist

Joyce's penchant for scatology in no way diminishes his canon's suitability for engagement via critical theory. If anything, the poststructuralist interdisciplinary approach is as natural a bedfellow for the interpretation of Ulysses of Finnegan's Wake as one could hope for.

To demean Eoin Colfer is another interesting hill to die on (Darren Shan?). Benny and Omar is a fantastic debut novel and a great introduction to class and cultural distinctions in the Islamic world as viewed through the eyes of a surly western teenager. The Artemis Fowl debut as well is a perfectly inoffensive fresh IP with an interesting take on putting a cyberpunk spin on Irish Mythology - although marred somewhat by an appalling cinematic adaptation.

To then cite Brian Jacques as a high-point, ploughing a furrow as he does in the foothills of mid-brow K-12 readership, only suggests to me somebody completely unfamiliar with the canons of Terry Pratchett or Philip Pullman. In any case, you seem to be conflating Young Adult Fantasy with the rich and well populated canon of Young Adult Fiction.