I have done exactly one Garliage campaign battle. It was maybe a month ago. I was there to do one of the Sandy [S] mission-quests and jumped into campaign while waiting for the rest of my party. I saw one person standing behind the fortifications whacking away, and later when I came back, she was dead. I assumed at the time she had reason to believe she was safe back there. Could be that someone dragged a mob too close and got her killed that way. If you were afk could be the same happened to you.
I've never tried campaign in the dungeons other than that. I prefer to jump around, but I guess if you want to stay in one zone, a dungeon zone might be at least as good as another.
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