You can use the visual scripting pong example from the demo repository as reference: https://github.com/godotengine/godot-demo-projects
I imagine the documentation will get better when Godot 3 is released, and more examples will probably come after that.
As for it’s implementation, I think it’s more or less finished. Visual scripting isn’t going to be as powerful as GDScript, so it’s possible there might be potential roadblocks if you’re heavily reliant on them. That said, it’s probably possible to make complete games with visual scripting.
(Personally, I’d highly suggest learning GDScript. If you understand the logic required for visual scripting, then you’re already 50% or more there for GDScript)
