It is awesome, but then my classmates for that course are all students who got admitted to my school (which admits around 7% of applicants to math) so I would expect them to be more engaged and to have better critical thinking skills than the average high school student.

I think the other issue we have (speaking for teachers now) is that you don't get to teach students from K-12, you get them for one or two grades max. I think the reason kids of highly educated parents tend to be better off is because they get the benefit over their entire childhood, rather than teachers who vary a lot from year to year.