"What does good peer-editing look like?"
Well, here are two real examples. I've edited out the names.
This first example is what a weak essay looks like after serious and thorough peer-editing:
And this second example is from a much stronger essay example, again, thoroughly peer-edited;
You know I'd like to point out here?
*Both* have a TON of written feedback.
Amount of ink =/= quality (good or bad) of essay
If you actually read the essays, you'll see what I mean. Essay Example 1 does not actually answer the question, and is poorly organized, and furthermore, is delivered with rudimentary word choice.
Essay Example 2 is much more focused and deliberate in its approach to the CF Essay Contest Question. Most of the edits suggest new words, phrases, and constructions, to convey what is a solid treatment of the prompt.