I do like it. It compares well with my Ruby code which is saying a lot. :-)
A lot of years ago when I started with Ruby, one of the first things I cared about was how easy it was to write OO in Ruby. I like it perhaps even better in Dart. Ruby has features that Dart will never have, not to mention that once Dart is released it may stop evolving, whereas Ruby that has evolved so much will continue to do so.
