Well, you have put some truly excellent teachings into his mouth, such as the one that I have taken the liberty of dubbing "Quirrell's Law":

The world around us redounds with opportunities, explodes with opportunities, which nearly all folk ignore because it would require them to violate a habit of thought.

"Professor Quirrell" is such an emulation, and sometimes I worry about all the people who say that they find his arguments very, very convincing.

I wouldn't go as far as to say convincing, but they are less appalling than the arguments of Harry, Dumbledore or Hermione.

Human minds don't anticipate a true sociopath who views communication (overt, emotional and habitus), as instrumental. You should already know we are easy to hack by that route.

Certainly I find him the most likable character in HPMOR. I'm wondering if you can recall how much effort per screen time you put into him, compared to other characters.

Or maybe this is because I personally value skill, expertise and professionalism over "goodness" (E.g. Prof. Moriarty over Dr. Watson.)