I recently crossed the 3k threshold and now have access in the Review Queues to Close/Re-open Votes (I actually have the ability to cast such votes). My question is simply: what should I read before casting votes? Obviously I need to read the question/answer and any comments. But the question is more specifically about site policy--how do you decide when something crosses a threshold of badness/incompleteness that it merits being closed? Should I just vote to close things that I would have flagged in the Low Quality queue? There I was a little less worried because I knew someone else would eventually have to vote and decide whether I was right or wrong. Now, it feels like it is (partly) my job to decide when those flags are right or wrong.