While reviewing low quality posts, I have had the same problem multiple times.
As an exemple, I had to review this question. The four choices are 1) Edit 2) Close 3) Delete 4) Ok.
As it is shown by the downvotes, the question seems indeed to be of low quality. However, the quality is not low enough to be closed or deleted (it is not spam or obvious duplicate). I can't really edit the question as I don't really know how to improve it (only OP knows how to do it).
My question is: in this case, is it expected to just leave a comment (and not if others have already done it) and click "seems OK", like I would do with First posts review (even though the question does not seem OK)?