He's writing in his second (third?) language. How's your second language?
Akita is a pretty smart dude. He makes a number of good points, and maybe doesn't tie them perfectly together, but it's a blog post he wrote in a day, not for Harpers.
A few points from his rant:
1. If you don't drink the kool aid, you'll be frustrated if you want something else 2. market forces: you have to follow rails, but if rails changes or goes away, you're stuck (-ish, it's OSS) 3. rails is good at what it does, and provides many with a useful framework, even if, in retrospect, it isn't well architected