... what would it be?
While I genuinely think Dan Proctor hit a grand slam with Labyrinth Lord, there are still some minor nits here and there to pick (though they are few and far between). If you could only pick on one, what would you choose to "fix?"
For me, I would reverse both the modifiers for Charisma and the reaction tables. I'd prefer that all "plus" modifiers be bonuses and all "minus" modifiers be penalties. Charisma kind of sticks out like a sore thumb in that regard.