I'm not quite sure the extent to which you're right or wrong, but a few points: 1- Once Minerva sees what she does of Harry's talk with Draco (realistic or not), it seems plausible she'd be impressed and give him slightly more slack because of it. In addition, once she begins to believe Harry has been abused it is possible she'd feel sorry for him. 2- Prior to this, I agree that she should have been significantly more annoyed- unless wizarding culture is very different for some reason, she should at least have been trying to restrain herself. 3- Part of the point of the fic was to attempt to popularise rationality (and it has at least extended the audience for Less Wrong's ideas). Given the necessity of that, changing Harry's backstory was probably the best way to do it.
I've been hearing about this fic for a long time, and I've been somewhat suspicious of it. I knew that Eliezer is a pretty good writer, but that his attempts to graft Bayes onto his characters are invariably rather inorganic. On top of that, OOC is irritating to me even when I expect it.
Nothing, however, prepared me for this. I just got done reading chapter 6. Up to this point, Harry's greatest sin was dumping a Less Wrong post onto poor Minerva every ten minutes. And she understood everything, including pop culture references (when in the books, most wizards don't comprehend rubber ducks).
Now, in this chapter, Harry thought he heard a strange note in the prof's voice, decided in a split second that she's trying to destroy his parents, and informed her of this suspicion in the form of a hissy fit. Then he started blackmailing her, and finished by implying that she's a nearsighted idiot, but it's alright, most people are. And he started calling her McGonnagal, then switched to Minerva, and is now planning on Minny for the future. I expected her to snap at some point and beat him to a pulp with the first heavy object that presents itself.
I read the reviews pertaining to that chapter. They all proclaimed it to be a masterpiece, the standard by which all other fiction should be measured. To me, it was what people call "epic fail". I cannot find any other way to describe my reaction. Calling it terrible just doesn't have that drop of vitriol that I think is necessary.
But this is Eliezer Yudkowsky. I KNOW he can write. I KNOW that he can detect and neutralize a Black Hole Sue. And yet...
Does he?