this sounds like a puff piece without really going into why "WP Engine" is such a good company. Aside from good customer service, and being able to respond quickly to emails, the article doesn't really say anything about the capabilities of their system or how secure it actually is, or even, what are some of the clients running on that system?
Yeah, I thought about letting Cullen address your comment but he specifically mentioned that they'd be making the information available for anyone to use and hopefully build upon.
It's certainly not hard to figure out what they're running of course. http://builtwith.com/wpengine.com and the "Net" tab of the Firebug plugin tell most of the story.
I think that's a fair accusation. I had been putting off the article for a while, but thought my audience (not really technical, but appreciative of product and service recommendations) would be lost if I went into the details of what made it exciting to me as a server geek.