Below are the points I like best in the library. I used this library to plot
1.) A Detailed documentation of every feature.
2.) Easy to use and implement in web application.
3.) Open source library, easy to download the latest version.
4.) It uses HTML canvas element so improvised and impressive bitmapped graphics.
5.) Learning is easy. Syntaxes are way more simpler than other like D3
6.) If we need only simple and basic charts like bar, pie, line then Charts.Js is best choice.
7.) Used globally, so if developer have any issue, she/he can ask questions on forums.
8.) Supports all browsers and devices.
Limited in features. only supports basic plots so I had to switch google graphs for my data oriented application. I think they should start to extend its functionalities. This library is light weight and fast so if they add more event handling and interaction features then it would be better than anyone.
1.) In my web application, I plotted charts of system configuration charts in distributed configuration. I used to plot graph between response time, Ram, disk activities and bytes transfer.