Thanks to a random Googling, I found this Gamma World essay/retrospective by Jared von Hindman. He lovingly goes through the history of the game, and hits each and every note as to why I adore the genre so very, very much.
The article is called Gamma World: Over 30 Years Of I Have No Idea What Is Going On. It's well worth the read.
(And I, too, was in the same GenCon 2010 seminar which prompted the entire piece. His recollections about the the griping are dead-on.)