The mvc team is a breath of fresh air, no question. But I'm surprised to hear someone who knows RoR say that they are "pretty close".

There's more to dynamic programming than the dynamic keyword. I don't want to get into which is better, but to say that C# is even in the same league as Ruby for dynamic programming, because of the dynamic keyword, is wrong - if for no other reason that properties from anonymous types (which dynamics are built on top of) are internal. Read meta programming Ruby, or try doing extensive [tb]dd with both, and you'll see how different they are (hint, you don't need DI frameworks in Ruby).

Ruby gems has a rich history, a strong community, and a proven track record. Every ruby developer has, and uses gems. Most packages are in known repositories. Gems has been extended to solve other problems (bundler). NuGet is a good and necessary start, but, again where you say "pretty close", I'd say "pretty far".