While I find Jeffries's attempt to make a sudoku solver with TDD a bit embarrassing, he's still done more to contribute to the debate than people who are standing on the sidelines being smug (or posting snarky comments on github). I admire his openness and humility.

Also, it's another example of iterative change causing something to go in circles around a local maxima. One issue with TDD is that this can still feel like progress - your tests are still changing from red to green, after all.