Personally, I can handle all sorts of adversarial situations, but I've never done well with "rigorous" interviews. I think I was raised to be humble and that's built into my DNA, but the business world embraces overpromise/underdeliver.

At the same time, I've successfully managed large teams, budgets, interfaced with super-high level people and negotiated hard-nosed deals. I gotten myself into these roles by other means -- 90% of interviews that I have done have been formalities.

IMO, that's a symptom of a bigger problem, as what you do has more to do with where you are and who you know than any other factor.