cartophile,
As much as I don’t really like It Couldn’t Just Happen and Defeating Darwinism, I think it will still be a moderately good fit for my family because of all the other subjects that are covered well but I think a lot depends on the Challenge tutors. The tutors in our group seem to enjoy a good discussion that includes opposing viewpoints and are comfortable with the class having a range of views. Having said that, I also want to make sure my kids don’t get trampled in class for having an opposing view. I think our tutors do a good job though of teaching debate/discussion skills and how to be civil in a disagreement.
I read It Couldn’t Just Happen a while ago and if I recall correctly, it’s not distinctly YEC, but definitely anti-evolution. Defeating Darwinism is more about ID and “defeating” materialism/naturalism but in doing so it perpetuates the false dichotomy between evolution and Christianity. I also dislike the catechism questions CC developed and I think I will make modifications to a few of them when my child memorizes them. The quizlet link may not be up to date (they make changes to the guides some years), but it’s probably roughly what they were using for the game you saw in class.
In terms of high school sciences, we probably wouldn’t use Apologia at home, but I think it’s easy enough to use something else because mainly what they do in class is the labs and then their assignment is to write the lab report. Because the sequence for science is probably inadequate for some of my kids, I may have them start Bio in 8th grade and then when their CC class does Bio labs in 10th grade, we might do AP Bio at home.
So the cycle that covered origins in Foundations, I was tutoring a class of 1st graders 
However, for the sake of the moms in the room, I did mention that the definition was lacking and gave a clearer definition and explained that the memory work is actually defining “abiogenesis” rather than evolution. I talked to our director who encouraged me to submit a form to CC to explain the error and suggest a correction. She also let me know that if I wanted to make a change to the memory work for my own kids, they could still test for Memory Master if I just let her know how they were memorized it so she could proof them. I appreciate the flexibility but I don’t know that all directors/campuses would handle it that way.