[Bigdaddy]

In a previous life, I would always look for results that were accurate, reproducible and defensible. How does PSA (or any grader) stack up?

Accurate - Well, we don't have any widely accepted standard on how cards are assigned grades, and even the standards each company has change with time.
So, there is no 'truth' to measure accuracy against.

Reproducible - Many cards get resubbed, some over and over, looking for a bump in grade. If their grades were reproducible, then there would be no desire to resubmit for a better grade.

Defensible - Ever wonder why a certain card received a certain grade? Want to see the grader's notes? Mostly out of luck here.

As some folks said above, this is a PSA problem. However, it becomes a hobby problem when blind trust is placed on a result that is not accurate, cannot be reproduced and is not defensible.