I've thought about this, and I don't really think the "early days" defence is really acceptable in this case. If Dart isn't better in some appreciable way than Javascript, it has no reason to exist whatsoever. Equally, why not just adopt C# wholesale (it's even registered with the same standards body as Javascript) and give it a new library suitable for web programming?
Not yet.
> No destructuring either.
There's a proposal floating around for pattern-matching that would address that too.
This is still early days for the language, so there's a lot left to be done.