Ifitaint... As far as I'm aware, not all that many (is that better?!) people were passing first time. If you have further info (freedom of information act should make this accessible) about all initial CFI candidate practical test results, who were tested by the Scottsdale FSDO in 2008/9, it would be interesting to see just how many got through first time.
I'm just going off what 2 DPEs told me. I'm not trying to scare anybody off and worry them about future checkrides, or get into any arguments.
At the time, the inspectors weren't a known quantity, as the rule had just come about that they had to do all initials, but I'm sure once word got around, and CFI instructors started to learn of their ways (and questions they were keen on asking) the number of first time passes increased.