Two things I don't like about Dart, just from reading the tutorial:

1. Consuctor syntax requires repeating the name of the class when yor define the constructor. So if you change a class name, you have to carefully find all your constructors and rename them.

2. Instance variables in classes seem to be defined at the same level as class methods. Yet one is an instance attribute, and the other a class attribute. So you have irregular scoping rules based on type (data vs. function). This scares me as it indicates functions are "special" and not first-class types in the language.