I don't agree with DHH on most of it's design decisions (but who am I, I don't have the same 'track record') but I do agree wholehartedly with his opinion voiced in his rant/"article". Sure, the title is a flamebait pur-sang for TDD zealots.

Like Slackwise said below; TDD isn't dead but everyone considering it as a silver bullet should scratch their heads... twice, and rinse and repeat.

> YOUR code is hard to test BECAUSE you don't TDD.

<downvote mode on> YOUR code is hard to understand due to high levels of decoupling; overuse of abstractions and refactorings for the sake of code beautification. But at least it's tested! <downvote mode off>