As of last week's AngularDart announcement, it sounded like the size of Dart to JS compiled code was still rather large. I'm surprised a 1.0 release has been cut if that is still a problem. I know dart2js can and I'm sure will be improved later, but people are going to make judgements about Dart the language based on its current performance.
https://github.com/jbdeboer/angular-dart-js-size/blob/master...