These categories are collectively defined and addressed, among other places, in the Help Center, in the guidelines for reviewing on Meta Stack Exchange, on Meta Stack Overflow (with nice examples) and as the "recommend deletion" canned comments2. The prescribed action is quite unambiguously to delete or recommend deletion, there is not much disagreement around them and their review usually doesn't pose much of a problem.
Now, apparently there is strong consensus that we should avoid deleting poor and wrong answers, as stated on Meta Stack Exchange (Guidelines for reviewing low-quality posts, How to handle low quality answers in LQP queue?, "What are the criteria for deletion?" in the in this FAQFAQ article about deletion, When should I delete an answer?) and Meta Stack Overflow (You're doing it wrong: A plea for sanity in the Low Quality Posts queue).
Can weBeing able to agree on some specific guidelines for our site? It would be beneficial to reviewers (less work for them in the queue), to answerers (a more clear message on what they did right/wrong) and to all users trying to learn the art of reviewing.