Over the last week I've done a number of reviews of new user first posts and late answers. I used as guidance, "Help your fellow members learn to use the site". With that in mind, I created lengthy comments explaining nicely why many of the posts weren't appropriate or how to post properly. Several times I was curious whether that input had any result. I went back to the reviews list to find the posts and they were missing. It finally occurred to me that the posts were deleted and the comments and record of review went with them.
The reviews don't take trivial time and I suspect the typical review doesn't entail writing a lengthy comment to explain things, so I'm probably putting in more effort than necessary. Clearly, many of these posts should be deleted. However, how will these "fellow members" learn what's appropriate or how to improve if the feedback is deleted before they have a chance to read it?
I'm left with the impression that any feedback on posts that are likely to be deleted is a waste of time, and that is the majority of "no action needed" reviews. Which means most feedback on posts that would benefit from feedback is a waste. The review process helps to keep the quality of the site up, but it looks like the two objectives are at cross purposes.