Hah I am the wrooooong guy to get angry at. I'm just speaking from experience and observation of others -- personally I greatly prefer the open source world.
I'm sure there are tons of crummy Java devs out there but there are also some brilliant ones delivering "corporate solutions" (fancy term for myriad proprietary frameworks) or just coding for Google. And there are talented/talentless in almost every community.
Why would you assume I'm snubbing my nose at open source when I'm advocating for Clojure? The JVM is a sick platform for web dev and it gives you the opportunity to use a variety of languages and open source tools in a single high-performance project.
I don't know if this is personally what you're getting at but it seems like a lot of the attraction to the scripting languages is sorta convention over configuration rather than some major shift in the web dev paradigm -- the same design patterns are possible in every language for the most part.
My point was merely that judging a single implementation is a straw-man approach. You don't know how motivated or talented those devs were in the first place.
EDIT: well, the comment was deleted so I guess the writer realized my position maybe(?). Well, Let the record show that open source exists all over the JVM... I don't know why it has the rep of looking down upon open source movements...