Ugh, `dynamic` doesn't provide the benefits of a dynamically typed language by long, long way, and yes I've used it extensively. But thanks for the downvote all the same.

http://wekeroad.com/2010/08/09/csharps-new-clothes/

In case you plan on skimming that and missing the details the tl;dr is that Rob, pushes `dynamic` as far as he can and it still comes up far short of the extensibility and expressiveness of Ruby constructs.