Ironically I had a new 88 Pontiac grand prix that had the exact opposite issue. The brakes were totally ineffective for the 1st 3- 4 stops or miles. it was a time when they were playing with composite rotors and pad materials. I had it back to the dealer several times to document the condition. The same car ATE the front Pads and Rotors with only 14K miles on them. Normal driving and the only car I've owned that didn't go 40K + on the front brakes.

I note others are posting similar issues. Can any of you see the rotor surface at all through the wheels?,
If so, you could try a kwik wipe with a CLEAN white paper towel or kleenex to see if it is wet or rusty for those thinking rust or moisture?
Or possibly to LIGHTLY ride the pedal for a 1/2 block or so?
Another question: do they all do this year round? (Humidity would be lower in the winter I would think)