I still don't get Dart. It looks like it has the worse bits of Java and JavaScript, while only giving you minimal improvement in semantics.

Why bother with optional types (if you're enlightened enough to realise that you can just throw them away, since they're not needed for optimisation) when you could have richer compile-time contracts? Why bother with classes at all, when you could just have prototypal inheritance + interfaces?

I don't quite get what the goal is.