As this thread has developed it appears that everyone has forgotten the topic. "Borderline" pitches.
Therefore TW344 I would take it as a complement, because if your pitcher was hitting the same spot all day, and it "was borderline" you would want it to be called a strike, wouldn't you?
Just came back from an umpire clinic (run by minor league umps) this weekend, and we talked about "borderline" pitches. The common answer was "if you can get it, call it a strike".
That is why the "borderline" pitch is "my strike zone". Not the pitch 6 inches of the plate, not the pitch at the shins, not the pitch at the chin. If an ump is calling the pitch at the shins, then, TW344 your comment is on the money.
The borderline pitch is what makes the game. It is the tone of the game that is set by the umpire for both sides. If the pitch is on the outside corner in the "borderline area" and if I call it a strike, or I call it a ball, I have set "my strike zone" for the day.