Will, good post. There is, at least weekly (?), as deep analysis simply in the comments (!) on this blog as one can get from just about any MSM medium I can think of at the moment (e.g., the jpe/Porlier/others God debate, or the r.johnson/jpe/Knippenberg/others Libby commutation, or Knippenberg/Kidd/Porlier/Expat religion-in-politics discussions to name a few). Without meaning to be a brown noser, I would say that this blog alone is a sufficient proof by counter example to Keen's assertion(s). There are many others as you note. I would add to your list your blog, and the following off the top of my head:
Real Climate
Climate Science
Sciencebits
The Becker-Posner blog
Actually there are so many academic blogs that provide deep analysis of pertinent political/social/religious issues, that listing them would probably be counterproductive. Others I would include:
The Volokh Conspiracy
Bitterlemons
The Belmont Club
Gates of Vienna
I swing conservative, but I will give a shout out to r.johnson's blog which provides deeper analysis than the MSM, at least.
There is, of course, a lot of crap on the web too, but the absence of oligopoly on the web makes Keen's assertions empty ones.