Yes, the major problems that we've been seeing are in terms of inflexibility and implementation more than flaws in the
ideals of CC.
That is, a Social Studies teacher with poor-to-mediocre written communication skills and zero training in improving/teaching student writing is
not the best person to be 'shaping' writing with an eye toward improvement. Ugh.
That seems to mostly lead to a lot of punishment for students who don't automatically give the teacher (stylistically) what s/he is "looking" for (but not telling students)... and very little in the way of real improvements in student writing as they scrabble ever harder to hit a moving and ill-defined target.
Oh, um-- hypothetically, I mean.

LOL.