Just wanted to chime in and say that I still remember the first code reviews I received and while I didn't take any of the comments personally, they certainly didn't feel great to receive. (I should add that I don't begrudge the reviewers, they were nice people).

These example notes are wonderful. They feel like an editor's notes, not a graded exam. Something you'd get from a colleague who is collaborating with you and not some infallible black-box oracle.