I love getting reviews, but I hate somebody trying to rewrite every word I've written. Been there, don't like it. Don't get me wrong - a suggestion here and there is great and appreciated. But to highlight every single paragraph is ridiculous unless I have asked them to do it in advance.
Last time it happened to me, I returned the review with this: "I appreciate all the time you spent rewriting my chapter so it sounds like your voice instead of mine. I am sure it was time-consuming but totally not necessary. Due to the fact that both you and I are here, on this site called The Next Big Writer, probably shows that neither of us has a best-selling novel on the shelves of Barnes & Noble. I would like that to happen one day, but until such time, I will continue to write in my voice and expect you will do the same. My one suggestion to you would be that if my voice perturbs you that much, I think you would be better off to find something else to read. Thanks for stopping by."