On RPG.SE, we've seen a negative pattern emerge. The moderators are also avid members of the site (part of the reason we became mods was having the highest reps). RPG.SE, like many of the newer SEs, has more of a subjective component than Stack Overflow and other "does the code work" SEs, so we have a lot of opinions and use Good Subjective, Bad Subjective rules to govern that, and it works quite well.
However, this leads to confusion among the community as to when we are speaking "as mods" or simply as members of the community with our own strong opinions on a question. This leads to people seeing "abuse, because that mod is taking a side in that debate on that site topic!" People then start seeing every mod activity through the lens of that mod's personal proclivities; both seeing "participant level" statements as the mod taking "official" sides among answering camps and seeing mod activities as being driven by their opinions on the topical debate instead of impartial moderation.
You can't eliminate all of that, and we try to coach the community that we all know how to keep that separate, we confer with other mods when we think there's a conflict of interest, and that they can always complain to the other mods if they think someone's doing wrong, but that in general we are and plan to be opinionated members of the site ourselves and not retreat into some kind of ivory tower mod-hood.
But I was on Parenting.SE recently and saw a mod put a mod comment on in all bold, which was clever and it made me think - should we have a distinct "mod voice" to make this distinction clear, whether it's using bold or some new "mod color" functionality? This is a common feature with forum moderators.
Do we think this would help? I'm torn - most of the stick we get is from the same 3-4 users who chronically think the mods are out to get them and I doubt any procedural or technical change would fix that, but it could reduce confusion among the mid-field of casual and especially new users.