Awesome Music: Even if you're not an Antwoord fan, the original score by Hans Zimmer is absolutely gorgeous. If you are an Antwoord fan, Cookie Thumper playing during the montage of Chappie learning to fight, and the score fading into Enter the Ninja at the end.
Base-Breaking Character: Chappie himself to most critics. To some, he's an adorable child-like robot who doesn't deserve any of the abuse he receives in the film, while others consider him the robot equivalent of Jar-Jar Binks.
Broken Base: The general reaction to Die Antwoord being cast in the film. People who are their fans or otherwise familiar with the characterization of Ninja and Yolandi reacted favourably whereas those already disliking them or unfamiliar to their characters did not. As seen in this wiki, there seems to be no middle ground.
Critical Dissonance: Some critics were brutal on the film, yet the audience opinions have been much more forgiving.
Friendly Fandoms: If you go on tumblr and look up the film, don't be surprised if you see fan art of Chappie hanging out with Baymax.
"Blomkamps disastrous film has no real sense of what it wants to be or what it wants to achieve. The unashamedly earnest, father-son relationship between Deon (a saintly sort who wants to selflessly aid human- and robot-kind alike) and Chappie (who serves as Frankensteins monster to Deons overwhelmed Doctor Frankenstein) speaks to a deep, almost embarrassingly[sic] sincerity at the films core. Chappie doesnt just believe in things. It believes in deeply embarrassing things like childhood innocence, and friendship, and how war and crime are not healthy for children and other living things."
Iron Woobie: Chappie himself, considering the sheer amount of things he goes through during the film.
Jerkass Woobie: For most of the movie Ninja keeps abusing Chappie and using him for his schemes, and many of his choices contribute in making things worse. He was however motivated by the desire to protect his companions from Hippo, and at the end, he's lost both Amerika and Yolandi. If it wasn't for Chappie and Deon (who'd have more than one reason to stay away from him), he'd be completely alone now. He finds the flash drive with Yolandi's conscience for Chappie to upload, but it's clear things won't be the same anymore.
Hearing the trailer announcer guy say "Chappie" in a ridiculously serious tone at the end of trailers.
Yo-Landi screaming "YOU'RE AN EVIL PERSON!!!" at Ninja after Chappie gets abused yet again. Ninja's weak "I didn't know this was going to happen..." adds to the hilarity.
Made all the more hilarious by Ninja's very prominent "EVIL BOY" tattoo.
Likewise, "YOU'RE A SHITTY PERSON!" from Deon after Ninja kicks him off the factory, though this may be intentional, as Deon IS a weird nerd.
Ninja's facial expressions. At one point we get a slo-mo closeup when he fires his assault rifle that looks like he's just stubbed his toe.
The ending. Yolandi dies earlier in the movie, but it turns out Chappie saved her consciousness as a backup. He proceeds to have a new, robotic body built for said consciousness. It's a drone like the ones Chappie and Deon inhabit, but with an not-quite-right feminine human face. Even worse, a particularly cheesy Die Antwoord song is playing over the sequence and leads into the credits.
Moral Event Horizon: Vincent Moore has several such as torturing Chappie in an attempt to steal the Guard Key or using said Guard Key to turn off all of the robots to make his droid shine, but the real kicker comes in the climax when he gleefully kills Amerkia and Yo-Landi with the MOOSE.
The first sign that Moore's a complete psychopath where he pins Deon to his desk and sticks a gun in his face in full view of their coworkers, then lets him go and laughs it off like a joke. Later on, we see him actually firing his gun in the workplace, further traumatising his coworkers.
The death of Amerika. Just being crushed by the Moose's foot would be enough, but Moore takes delight in using the mech's pincer arm to tear his upper part off and throw it against a wall.
Chappie's beat-down of Moore. It's both satisfying and horrific. Michelle's look of terror is a reminder that while the protagonists and the audience see Chappie's sweet side, the general public and the rest of the office sees a rogue robot perfectly capable and willing to beat down or kill someone without even needing a weapon.
Hippo is the scariest human in the movie, even more so than Moore, who at least tries to control himself. A sadistic, unhinged psychopath with a small army of disposable gangbangers at his command, he'll go from growled threats to "let's just kill everyone and call it even, eh?" without batting an eyelid. He doesn't seem to being enjoying himself unless he's threatening or brutalizing something.
Uncertain Audience: As pointed out by Nathan Rabin in his review, the film seemingly can't make up its mind on whether it should be a violent, R-rated crime drama or a family film starring a quirky, child-like robot. The result is a film that's too violent for anyone under 17 and too stupid for anyone over 17.
Unintentionally Unsympathetic: A major problem manyhadwith this film is Die Antwoord's characters in it. The film tries to make them sympathetic criminals surviving on the streets, but most people simply found them to be scumbags who manipulated Chappie into a life of crime. The lackluster acting from them doesn't help either. Although it's debatable that the film portrays Ninja as sympathetic at all until the very end when he attempts to sacrifice himself; conversely, Yolandi is depicted throughout most of the film as a motherlike figure towards Chappie.
What Do You Mean, It's Not for Kids?: A movie about a self-aware, peace-loving robot who just wants to live and be left alone and his scientist friend who's helping him evade the authorities who want to capture him...sounds like the typical family film plot, right? Actually, it's an R-rated action movie, and while it's not nearly as violent as Blomkamp's other films (there's exactly one explicit gore shot in the entire film), it's certainly not kid-friendly. Ninja's dialogue is pretty much one straight Cluster F-Bomb, for example.
WTH, Casting Agency??: Pretty much everyone's reaction to Die Antwoord being in the movie. Ninja had initially been promised the main role in Elysium and gotten shot down by the studio (Eminem was also considered early on); putting Die Antwoord in Chappie was essentially Blomkamp apologizing to them.