Personally, the only things here that seem to irritate are the first posts from new members who clearly haven't looked the board over. Past that, there are the bot members, but it seems even that has calmed down.
I'm a member of several other boards. A couple are airplane related, and are pretty much unmoderated. Political and personal rants make up nearly half of the activity there, which can sometimes make the place somewhat unpleasant. On the other hand, another pilots' board does have a moderator. He doesn't have to growl often, but knowing he's there does keep the board focused.
I think you're doing a fine job, Mike. Keep up the great work!
Jack