my list of pet peeves about classmates is pretty long: classmates who expect detailed criticism of their work but are lazy at criticizing others' work; classmates who write in genres I'm not interested in; classmates who bring personal issues to the critique process; classmates who use writing as therapy rather than as a form of artistic production; and so on.
Holy moley--ain't that the truth! I prided myself on reading the other students' works with great care, and in every case I made sure to comment extensively on the good and the bad. But they'd return my works with unhelpfully vague comments like "Great!" or "I don't like this." It's a give-and-take process, for pity's sake!
The writing-as-therapy stories were also excruciating. Look, I'm sorry that you have issues about being stood up for prom, but you really need to get your thoughts in order before inflicting yourself on your innocent classmates!
I also agree with you about a well-formed character giving rise to its own behaviors. As you say, it's the logical progression.