Chappie can be good for learning English if you already understand everyday conversations and want more consistent practice. The vocabulary is not overly technical, though it includes enough variety to make the practice meaningful. Also, crime scenes may bring in words related to investigations, police or legal vocabulary. The storyline is easy to follow, so missing a few words should not stop learners from understanding what is happening. At an average of around 84 words per minute, the dialogue is generally manageable, though some exchanges require more attention. If your English is close to B1/B2, Chappie can be useful for building listening confidence.