I'm doing this because I'd like to take my handling of undesired content beyond mere flags and close votes. I want to make a direct impact on the quality of what we see here on Super User.
You see, there are many things that an ordinary user can do, like vote to close on older questions, that often get missed by other users. While the new review system certainly helps bring attention to these posts, with the full moderator tools, we won't have to wait on other users to take care of content that might well have been deleted or closed one year earlier.