Adaptation Displacement: Exploited. Oz is legally a prequel to the books, but intends to be a prequel to the film. This even extends to the movie's title. "Oz, the Great and Powerful" is the moniker the Wizard uses in the 1939 film; in the book, he styles himself as Oz, the Great and Terrible. Not to mention that the Wicked Witch of the West is portrayed with green skin, which she only had in the 1939 movie (in the book, she was just a withered old woman with an eyepatch).
Critical Backlash: While not panned, there was a strong negative attitude towards the movie, partly because it was a prequel to one of the most beloved fantasy films of all time. As the years have gone on, more defenders of the film have popped up. Taste of Cinema also included it on a list of films 'That Need To Be Re-Evaluated By Critics'. It also got compared more favourably against the similar Pan - a fantasy film that attempted to do the same for Peter Pan - which was critically trashed.
Draco in Leather Pants: Alright, show of hands who has read fanfiction involving Theodora getting redemption, even though the film shows that this is literally a physical impossibility? Hilariously enough, Mila Kunis does wear leather pants in this movie.
Joey King as the China Girl is often cited by critics as the best character in the movie.
Rachel Weisz's wildly against type performance as Evanora is beloved too, both for Evil Is Sexy, Evil Is Cool and the fact that she's clearly having a ball in the role.
Evil Is Sexy: Evanora, as played by Rachel Weisz in a black dress. Until her true form is revealed, at least. Averted when Theodora becomes the Wicked Witch of the West.
Fanon: It's widely agreed that Oscar and Theodora had sex in the field after the campfire scene. The movie only implies it with a dreamy shot tilting up to the sky, but some fans like to theorise that it was Theodora losing her virginity. She loves him after that moment.
"Funny Aneurysm" Moment: When Glinda reveals Evanora to be the real villain of the story and that Evanora had tricked Oz (you know, like he did back in Kansas, only with parlor tricks instead of real magic), suddenly Oz's interactions with Evanora become Laser-Guided Karma.
Genius Bonus: Oz's love interest back in Kansas, Annie, is going to marry a man named Gale. Dorothy's surname is Gale. Fridge Horror in that one of the Oz books specifies that Dorothy's parents died around her birth, so Aunt Em and Uncle Henry raised her.
In That '70s Show, Mila Kunis's character Jackie played Dorothy in the Off to See the Wizard episode. Donna was mortally offended that Jackie imagined her as the Wicked Witch of the West. In Oz the Great and Powerful, Jackie is the Wicked Witch of the West.
There's a lot of parallels to Tim Burton's Alice in Wonderland (2010): both are big-budget 3-D Disney movies about people who go to a fantasy land that was All Just a Dream in their respective original movies, discover they're prophesied — by name — to save the land from a pair of warring, psychotic sisters, but the Big Good on their side is forbidden to kill, and the Big Bad(s) are exiled in the end.
Moral Event Horizon: If Evanora hasn't already crossed this with the murder of Glinda's father, she crosses it when she tricks Theodora into losing her heart and all her goodness, and becoming a witch more wicked than she is. Even she realized after this act that she had taken her quest for power too far and that there was no turning back.
Graham Norton had this reaction to the campfire scene when the clip was shown on his show. Specifically Theodora Shaking Her Hair Loose. He burst out laughing, as the scene out of context made it appear as though Oscar had never seen hair before.
Again, Theodora. It's rare that a performance can be so hilarious and terrifying at the same time, but Mila Kunis somehow manages to pull it off. She is trying to fill the pointed hat of one of the greatest Large Ham roles in cinema.
Oscar's performance as "The Great and Powerful Wizard of Oz" is such over the top scenery chewing that it would plunge headlong into Narm territory if it also didn't happen to be his truly epic victorious Moment of Awesome against the wicked witches with Rule of Cool on his side.
Never Live It Down: A lot of the complaints say that Theodora became the Wicked Witch of the West because she was a Woman Scorned. While there is some truth to that, she becomes so because her sister corrupted her.
Older Than They Think: Some thought China Town was thought up for this movie — it was in the original book.
Relationship Writing Fumble: One of the most vocal complaints about the movie is the writing of the relationship between Oz and Theodora. Theodora's Start of Darkness was a result of Love Makes You Evil... but the two of them were barely on-screen together at the same time to develop such deep feelings for each other. The rushed nature of the development made it stand out more.
The Scrappy: Theodora. Hoo boy..... Not only has Mila Kunis' performance been absolutely panned, but the idea that the Wicked Witch of the West is nothing more than a teenager who got dumped by her crush did not go over well with fans of the original.
So Okay, It's Average: Has some genuinely good scenes, Little China Girl is simply precious, and some good humor. But other things such as the performances of the two leads and Theodora's character arc bring it down to average for some viewers.
Strangled by the Red String: Oscar and Theodora. A major part of the movie's plot revolves around her falling in love with him, and then turning evil after she thinks he's betrayed her. But this falls short when you realize that Oscar and Theodora have only known each other for a day or two before he leaves the Emerald City and they don't see each other again until after her Face–Heel Turn. Despite this, she's already talking about how she'll be his queen and they'll rule Oz together, and completely breaks down when she thinks he's cheating on her. It's also not entirely clear how far their relationship went to begin with and whether they actually slept together or not, which can make Theodora come off as a Clingy Jealous Girl or a Stalker With a Crush.
The Wizard of Oz continues to cast a huge shadow over pop culture, so a film positioning itself as a prequel takes a lot of nerve...
On a similar note, Oz already had a beloved unofficial prequel in the form of Wicked, and many fans of both the novels and the Broadway musical adaptation were less than thrilled that this film is incompatible with the canon of either.
Headstrong as China Girl is, your paternal/maternal instincts kick in when she's onscreen.
The girl in the wheelchair who China Girl is based on. It's heartbreaking to see her belief in magic crushed after Oz reveals to her that he can't help her walk again.
Frank, Oz's assistant back in Kansas. He's devoted to Oz despite Oz being an outright Jerkass to him. And then he watches Oz get sucked into the tornado and we never hear from him again.
Glinda. Between having her father killed, being framed for his murder, and getting tortured by the wicked witches in the climax of the movie, she's been through a lot.
Theodora. A kindhearted, young, innocent girl who only remained neutral to keep peace between two feuding witches and in Oz. She's tricked into becoming evil against her own will by her own sister, who exploits her passionate love for the hero. She clearly is under the influence of magic while evil, and yet the people of Oz hate her, unaware of all this.