Conversely, I have found complaining to be a symptom of under-utilization of natural troubleshooting skills. Redirecting them toward solving problems takes 2 issues off the board.

I have also found complainers who were detail-oriented in a way that they reliably handled the kind of maintenance tasks that were often ignored.

Mostly I'm talking about complaints that come from a place of powerlessness. I often find those folks are broadcasting clues about where the they can be useful.