That said, I totally agree that Martin is a salesman. I knew him in the early days of the Agile movement and he did a lot of good then. But he's become consistently more strident, more dogmatic, more unpleasant. It's sad to see, really.
I think it's the archetypical story of you either die a hero... People find new ways to cope with complex problems, they soon become bound to those new ways.
No, I think he's become the villain for unrelated reasons. A lot of the early Agile people are still out there doing good work. More than I'd expect, honestly; the people who are attracted to a wild, early-stage idea are a very mixed bag.