Eh, I personally disagree with that notion but to each their own. I’ve read the first three and while I don’t consider them literary masterpieces by any means, they’re fun stories and are bizarre in a charming way. They stand out well enough on their own and I found them to be competently written ( the writing is relatively simple and straightforward so that the story is easy to understand - but not once do the books ever talk down to their audience. They don’t treat the audience like they're stupid and certainly don’t shy away from having dark moments, Ex. The tin man killing an entire pack of evil wolves in order to protect his friends.)
Speaking of which, I think that’s something Disney has lost this past decade. A lot of older Disney films, even the more light-hearted ones, had some dark asf moments. They didn’t shy away from shit. That’s not to say they were gory, but they knew when to get serious.
(Some examples: The Evil Queen being creepy asf and dying via getting crushed, Maleficent calling on the powers of Hell to turn into a fucking Dragon, Cruella wanting to skin puppies for a coat, The Horned King, Scar being a tyrant who very nearly won before getting eaten alive by his own henchmen, Sykes’ dogs getting electrocuted to death/ Sykes himself getting obliterated by a train, and let’s not forget Frollo getting dragged down to Hell by a Gargoyle Demon)
Idk what happened, but Disney pussied out and it sucks. It’s not like it was a long time ago either (Tangled had Mother Gothel’s death and Wreck-it-Ralph had Turbo/The Cybugs.)