If he or she is feeling a bit less tolerant than usual, or there's been a run of PITA threads, patience may get thin and the moderation may be harsher than you might like. However, if you want absolute consistency then hire robots.
So extrapolating that logic a bit, it is OK if I just fly the approach a dot low if I've had a crappy day? Or four whites if I'm feeling particularly happy? Maybe I should just make up my own minima if the F/O is giving me grief...
I don't think it's asking too much for moderators to be fair and consistent. Nobody is twisting your arm, you clearly want to do it, so why not do it well? Why apply a lesser standard than you would in your job? This is now a large, international forum, and it deserves the best moderation possible. If moderators feel that they can't act in that capacity, then with the greatest of respect, they should move aside.