I read a bit more into Dart, its optional typing is very interesting. I might even like that if it were a change to Javascript itself.

Of course Javascript has problems, every language has problems associated with it. They all have strengths and they all have weaknesses.

From what I've seen, projects like GWT, Dart, and Coffeescript come out of communities of developers other then the web development community. GWT and comes from Java engineers as an attempt to not have to write javascript, Coffeescript comes from Ruby developers attempting to accomplish the same thing. Now Dart is another attempt by the Java community to not write Javascript.

The thing is, I never hear from the web development community that Javascript is broken, missing major features, and needs to be replaced. These are the people using Javascript every day. The people that say Javascript needs these features are people who don't use it that much.