This is not about whether or not blinding critical is good or not, but about if it's a L/G approved tactic to perform on an opponent. Would blinding an enemy mid-combat not mesh well with a paladin of Iomedae and, if that's the case, what are some good critical feats that are paladin approved?
"Son, we live in a world that has walls, and those walls have to be guarded by men with swords. Who's gonna do it? You? You, Lt. Weinburg? I have a greater responsibility than you could possibly fathom. You weep for that goblin, and you curse paladins. You have that luxury. You have the luxury of not knowing what I know. That the goblin chieftain's death, while tragic, probably saved lives. And my existence, while grotesque and incomprehensible to you, saves lives. You don't want the truth because deep down in places you don't talk about at Andoran dinner parties, you want me on that wall, you need me on that wall. We use words like honor, code, loyalty. We use these words as the backbone of a life spent defending something. You use them as a punchline. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the blanket of the very freedom that I provide, and then questions the manner in which I provide it. I would rather you just said thank you, and went on your way, Otherwise, I suggest you pick up a weapon, and stand a post. Either way, I don't give a damn what you think of my methods." -Paladin Jessep