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.
Broken Base: You'll find fans who only love the Walt-era films, fans who love the Renaissance era films and view most of the older ones as Narmy, and even fans who love the earlier Renaissance films but don't care much for the later half. And then, of course, you have fans who judge each film based on its own merits.
Dork Age: Has gone through three distinct ones: the wartime period where they could only afford to make compilation films (of which only a few segments, such as Pecos Bill, Willie the Operatic Whale, Mickey and the Beanstalk and the entirety of The Adventures of Ichabod and Mr. Toad are well-remembered while the rest are usually forgotten); the period after Walt died and the entire company lost its way, in which production of films grinded to a halt; and the millennium years, where most of their films flopped. However, the only films anyone in the Broken Base agrees on as being undeniably bad are Dinosaur, Home on the Range and Chicken Little.
Strangely, in a recent book about the history of Disney animation, Hunchback was criticized and Hercules was outright panned by the author, who, apparently having no taste whatsover, went on to praise Home on the Range and Chicken Little. While the rest of the book was well-written, this did not go unnoticed by snarky Disney fans.
Growing the Beard: Has happened three times over the course of the past 75+ years. The first was Cinderella, which was Disney Studios' first big hit since Dumbo. The second was The Little Mermaid, which was the starting point of the Disney Renaissance. The third and most recent was Meet the Robinsons, which was the first film released in the Lasseter Era.
Arguably, Snow White and the Seven Dwarfs is this for Disney as a whole, shifting away from the whimsical cartoons and into full length, and better animated stories.
Moral Event Horizon: Many of the movies have the main villain do some form of Moral Event Horizon at some point in the franchise where they wreak their havoc - mostly so that even small kids can tell who is the good guy and who is the bad guy, and determine that the bad guy DID deserve a violent death or, at the very least, a thoroughly spectacular form of Abject Humiliation Conga.
Seinfeld Is Unfunny: Snow White and the Seven Dwarfs. It's been parodied and copied to death. Watching it after being exposed to the media for ten years is like watching cliché after cliché unfold predictably. Warning to parents: if you want your kids to love it, make sure they watch it soon.
Vindicated by History: Hunchback and Herc, at least, have been vindicated by disney fans, mostly thanks to having one of the most evil and one of the most genuinely likeable villains in the canon (Frollo and Hades, respectively). In addition, they have some of Alan Menken's finest soundtracks and, in the case of Hercules, being one of the funniest films in the canon. Pocahontas also got this to a lesser extent - while it's viewed as the weakest of the Renaissance, it's still a decently popular film in spite of its flaws. Ironically, it's Shrek that gets panned now thanks to DreamWorks Animation endlessly rehashing the Shrek formula and continually copying Pixar before they Grew the Beard with Kung Fu Panda.
Also heavily Vindicated by History was Robin Hood. Viewed as a terrible movie by the company itself back when it was released in 1973, it has since then become a well-loved and fondly remembered Disney classic in its own right. Mentioning it around "90s kids" who grew up on Disney VHS tapes will result in many nostalgic swoons.
Strangled by the Red String: This is the case with earlier movies, particularly ones like Snow White, Sleeping Beauty and Cinderella. Justified, as it can be chalked up to Disney trying to keep to the source material, which in those cases were mostly fairy tales meant to teach morality and not build a believable love story. (The former two actually inserted scenes so that the "prince out of nowhere in the end" was actually introduced to both the audience and the princess earlier on in the movie, but they still get flak for it.) Later movies fix this, by giving the couples more interaction and personalities beyond "She's the girl of my dreams!"
Visual Effects of Awesome: This was the codifier (nay, maker) of sophisticated 2D animation as we know it, but the Golden Age films really stand out.
While the Renaissance Age films were some of the first to prove the potential of CGI. The animators seem to have created self imposed challenges to improve things considered difficult to make in CGI, such as hair (Tangled) and snow (Frozen.)
What Do You Mean, It's for Kids?: Most people think of violence as not kid-friendly, yet the vast majority of people (including Disney's marketing) consider these to be family or kids' films. Most of these films have a villain who tries to commit murder (and succeeds in the case of The Lion King) and ends up dead himself/herself by the end of the film.