Dart's awesome.

I'm sure C# is too.

I've been unlucky enough to have many years in on both iOS and Android, and Dart is a fantastic language, far better than both incumbents.

I worry about judging it as a whole, based solely on their ability to launch pre-compile time code generation that is faster than their current approach.

Macros seemed really cool + really difficult to improve past the current codegen.

I have a 35K LOC "main" code base that generates 670K lines of code under the current approach. It takes 52 seconds for a cold generation of all 670K. Seconds for warm. shrugs (sounds great to me)