Ben
Best bits
In my opinion the best two elements of Server Fault (and the reasons I registered as a user in fact) are the overwhelming sense of friendliness and willingness to help. I have registered on many internet forums in the past, and posting as a newbie I was often put down in some way by someone who had a high post count and was thus "more important" than me. My first posts were usually disagreed with and I wasn't made to feel particularly welcome. Here at Server Fault, I "lurked" for a while so I could get a feel for the place, and was bowled over by the sense of community and real friendliness, even by the high rep users (who on forums I'd experienced in the past I would generally consider to be jerks). When I had a problem I couldn't figure out, I was confident that when I posted it on Server Fault I would be met with some friendly and awesome answers by some incredibly clever people.
As a moderator, I would continue to encourage this friendly behaviour and try to make Server Fault a better place by removing the "noise" posts we get (non-answers and spam). I want Server Fault to be the place for people in our profession to go to share their knowledge, and in my efforts to remove all the noise I hope to encourage even more professionals to join and participate.
Worst bits
As mentioned by the other candidates, we do seem to have a problem with inappropriate comments. It's not a major problem, but a problem that needs to be addressed nonetheless. I am certainly not playing totally innocent here - I have posted the odd snarky comment at the end of a long and hard day, but I usually deleted them after a few hours when I'd cooled down. I have since realised that such grumpy comments are unacceptable, and as a moderator I would work to remove such comments that poke fun at people or don't really add anything to the discussion. I would give gentle reminders of what comments are designed for, as people seeing a moderator discouraging something will be less inclined to do it themselves.
Another problem is we can be very quick to jump on the close button. We need to figure out what the original poster really wants and try and edit the question to fit. Bad English and grammar can easily be fixed with an edit, and can really salvage a potentially good question. I have recently started to do this to poor questions that I see, and as a moderator I would continue this trend. Again, people seeing a moderator do this might be more encouraged to do it themselves, or at least not go straight for the close button and try and figure out what the question asker really wants.