I am strongly of the opinion that the majority of edit reviewers do not take the time to go through the question, the comments and answers and understand their relevance to the suggested edit and then review the edit.
I think the Community bot could do that just as well as those edit reviewers:
if (too much red in the original post or too much green in the edited post) reject
Whereas, ideally, what a human reviewer should do,
if (too much red in the original post or too much green in the edited post) read the question read the comments read the answers understand all the read material as one coherent post if(edit drastically different from understanding) reject
I have faced this issue too many times (examples of which can be found here and here). On the other hand, I have been lucky a few times to have my edits reviewed by people who did take the time (one example here).
I honestly feel really bad for those posters because they definitely need help/want to provide help, but, they do not get enough attention (or get down-voted) because of simple issues like poor grammar, bad formatting, etc. which are fixable by edits and/or clarification by the poster.
Now I understand that there are people who mindlessly edit out stuff/add stuff and that's why this review system is there in the first place. But, I'm sure there are people like me who actually take the time to rephrase the post to more clearly convey their meaning. In my case, I almost always verify my point of view with the poster before editing (the exceptions being when I am 100% sure I've understood it right).
A comment on an earlier question about a rejected edit was that the majority of rejected edits actually deserved to be rejected so nothing needs changing. I understand this, but it really does get me down at times.
I've been trying, in vain, to think of some feature request that can at least reduce this occurrence without irritating everyone and worsen the site's user-experience. This is why I'm posting a question to ask the community whether they agree with me (or not) and if some people do, whether they have any ideas. And if they don't, tell me why I'm wrong or the effort isn't worth it :)