Chappie is created to protect and also obey orders but he is been compromised when he is reprogrammed. He later becomes the first robot with a self conscious programming and can also think and feel.
The film isn't bad and can be very funny (although this is, at times, involuntarily), the central character is endearing and the plot promises enthusiasm. [Full review in Spanish]
Chappie makes no more sense than the ludicrous alien takeover of District 9 and is just as visually ugly, but, without a Roger Ebert to shill for it, the formula now seems especially out of date and particularly depressing.
While the visual effects are spectacularly seamless, they're in the service of a movie which devolves from vaguely funny to just-plain silly to numbingly gory.
Although mildly entertaining at times, especially in the beginning scenes when we first see Chappie come to life, the film suffers from an uneven storyline.