They listened! I was marking the fukk out when the song kicked in during the end scene.
But the movie itself, as some have mentioned already, is entertaining but flawed. It's levels above Elysium but it still falls into the same pitfalls as that one and District 9, in particular that Blomkamp isn't a great storyteller. The man has great concepts and interesting ideas, but seemingly no ability to work them into a smooth story. Instead of doing some proper world building the movie just opens with an info dump and almost all the characters are only serving their purpose in the plot, without any proper motivation. Especially Tetravaal, the big corporation in the movie is a joke. The progressive scientist, the uncaring CEO who's all about her money, the angry competitor, they're all underdeveloped clichés. And also, they are literally the only three people in the corporation that do something. Everybody else is completely indifferent to all the fukkery that is going on there, making the roles of those three characters even more forced than they already are.
On the other side there's Die Antwoord, who bring the most entertainment as they try to turn Chappie into a gangster that will work for them. Those are also the best scenes in the movie, when they use an elaborate lie to get Chappie to steal cars for them it's pure hilarity, as well as them convincing Chappie, who refuses to use guns because they hurt people, to use knives and throwing stars because 'stabbing people puts them to sleep'.
Also, the blatant Sony advertising has to be the all-time worst I've ever seen in a movie. They randomly get a pile of PS4's of a weapons dealer, which is bad enough as it is, but later they actually hook them up together because they need the combined CPU power to try to transfer Chappie's consciousness into a computer.
Also, the ending action sequence was really mishandled, because Jackman's robot is so ridiculously OP compared to what he faces (Chappie and a bunch of gangsters) that it makes no sense any of them are still alive after the first twenty seconds when he's firing his minigun, multiple missiles and dropping goddamn cluster bombs on the whole area. I did really like the turn things took toward the ending though, I didn't expect it to go there and even though it was underdeveloped, as well as ripping off a similar concept Blomkamp already used in District 9, did lift the movie up a bit. It's just a shame that Blomkamp is so limited to only his concept that we never get a fully functioning movie out of it.