The write/build/test compile cycle is slow as f-ck

I work on a million LOC project that takes 3 or 4 minutes to build. If that feels too slow, you can selectively build projects. I'm not sure what your definition of "slow as f-ck" is, but it doesn't match mine. In exchange for compilation you get significantly better performance than you would with Ruby, Perl or Python.

  C# isn't really all that supported outside of Windows, 
  which sucks for server centric apps. 
  Yeah, you can use mono, but why? 

Why not mono? It works well, runs everywhere, it's fast, and there are a lot of people working on it to keep it up to date.

  C# is grossly verbose in contrast to ruby/php/python

Patently untrue with the addition of the dynamic keyword

  PHP is instant gratification. Change, reload browser, lather, rinse, repeat.

ASP.Net mostly works that way in .net 3.5.

  Lack of open source libraries + libraries you have to pay for = suckage

This is hit or miss, and the open source library story is not remotely as nice as Ruby, Python, Perl, Common Lisp, or Smalltalk.