The worst of both worlds: Dart fails to provides the advantages of static languages, without compensating by the flexibility of dynamic languages. Nothing has been learned from the dynamic language renaissance of the last ten years; nothing from the functional world; nothing even from the slick concurrency model of Go and its goroutines, also from Google.
So I think it's a step backwards in language design. With Node.js and Coffeescript around, and the programming paradigms they allow, Dart looks already obsolete and inadapted.
