Contrary to some of the opinions here about moderation, I'd amp up the moderation level in one specific way: I'd moderate new threads from new users by default.
The only two forms of noise that are of any particular annoyance to me are spam (there was a wave of it this morning) and people who show up here, mistake it for an airline's feedback form, vent about how Airline X must be a scam because they wanted $200 to change a flight, and never come back.
A moderation queue for any new threads from people who have posted fewer than ten times or whatever would fix it quickly.