It has good support of asynchronous programming in java which allows us to write code that scales well with our application's needs as it can handle millions or even billions of messages per second without any issues at all!It also provides excellent debugging capabilities by allowing you access logs directly from your IDE ( IntelliJ ).
The documentation could be better but not much really. As I said above though there are no problems using akka when writing large scale systems such as those handling lots of data coming into an API etc.