These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Kingdom Keepers
Anti-Climax: The finale of the first book-Wayne and the Kingdom Keepers gather together in Cinderella Castle to see the effects of Walt Disney's first pen, which is supposed to be very important and powerful, for themselves. Wayne places it on a blueprint of the Magic Kingdom, the drawing lights up as does the whole park, a multitude of fireworks go off in the sky, and... that's it. That's all that happens. The fireworks are reported as something done for a private celebration the next morning and Wayne sends the Kingdom Keepers home. Oh, the rides fix themselves too, but that's barely mentioned.
Most Disney fans make the argument that Pearson hasn't done research into the spirit of the park itself, including the fact that Walt Disney didn't even want to use holograms in any of the rides or the park itself after being approached by a company that created them, and Imagineers have continued to stay away from using them ever since. So technically the DHIs should not even exist!
Plus, the park is NEVER completely abandoned after it's closed, not even by characters come to life. There are cleanup crews, Cast Members double-checking rides to make sure they are working and safe, and more. Plus, if there were characters running around and chasing the DHIs, wouldn't security have noticed by now?
Speaking of which, there are a ton of characters that walk around where they're not supposed to be, like the Fantasia Brooms in the Voyage of the Little Mermaid show and the Country Bears in Mickey's Philharmagic. Not to mention Maleficent and Finn dressed as Aladdin fighting in Tomorrowland IN BROAD DAYLIGHT WITH A WHOLE CROWD OF TOURISTS WATCHING. As a former Character Attendant Cast Member, I'd like to say if that really happened in the park, that would never go over as smoothly as it did in those books. There's always a Coordinator or Manager watching the action somewhere and ready to report to the higher-ups in any department. This kind of action qualifies for instant termination for whoever's in those costumes. Yes I know they're technically the characters themselves, but nobody questions that they're there to begin with? Nobody notices?
Also, the preview for the seventh book says there were six weasels with Judge Doom. There's only five in the movie. Either a new weasel has joined the Toon Patrol, or this is a very glaring version of this trope.
Darkness-Induced Audience Apathy: By the sixth book some fans have stopped reading because they feel it's gotten a little TOO dark, even by Disney standards A blood sacrifice resulting in the death of a minor character by his best friend will do it.
Lost Aesop: "The Stonecutter's Quill" story in the first book. Perhaps it will enlighten our heroes by saying how thankful we should be of where we are now and of the advantages we have by being ourselves...but instead it's all about power...and it's never mentioned again anywhere or resonates with anything in the rest of the book.
Marty Stu: Finn, oh FINN. He instantly has the answers to everything, he's automatically the unquestioned leader of the group, and most of the girls in the books want him. Plus, he never changes, grows as a character or learns anything.
New Powers as the Plot Demands: By the fifth and sixth book, Fin starts having visions of the future for no reason and gains immense strength. He also gains a strange connection with Maleficent. Oh, and did we mention Jafar can turn himself into ROPE? Remember that scene in Aladdin?
Rouge Angles of Satin: The later books have shockingly become riddled with misspellings. Did Ridley Pearson really not check his work before he submitted it?
Said Bookism: Just TRY to keep track of everytime another word is used where "said" would have been just as appropriate, if not more so.
They Wasted a Perfectly Good Plot: An adventure in the Magic Kingdom and the other Disney Parks after dark with the characters coming to life and fighting Disney villains? Sounds awesome! Until you get to the bland characters, too much focus on the technical aspects, poor characterizations of characters we already know and love...how long until Jon Favreau's Magic Kingdom movie come out?
Time Marches On: The first Kingdom Keepers book dedicates a significant portion to the five friends interacting in Virtual Magic Kingdom...which was shut down shortly some time after the book was published. Plus, everytime there's a significant change in the parks, like Toontown being razed for the New Fantasyland Expansion, they have to find a way to work it into the books, mostly because it was mentioned in the story before the major change.
Wangst: Finn has to deal with bullies, high school, love triangles, disapproving parents and OH MY GOD you have Disney villains to fight, just get over it and save the world already!
What Happened to the Mouse?: They keep mentioning and hinting towards Finn' sister, but she never makes an appearance or does anything important. Why is she even mentioned?
The Woobie: Dillard. The poor guy's been totally abandoned by his supposed best friend. and he gets killed in the sixth book all because he wanted to be a DHI.