The things that people would most likely vote on are not really relevant. "I successfully made a simple chart based on the examples with this library" -> 5/5. I

The things that people would most likely vote on are not really relevant. "I successfully made a simple chart based on the examples with this library" -> 5/5. If you need more than the examples, most people will have different backgrounds and requirements. What library they can best use depends on that.