I think it inconsiderate to use duty finder and not know the fights.

Sure, I understand the idea of going in blind and how a segment of players enjoys that. However, those players should seek out like minded people to explore and learn fights with rather than subject some random strangers to their ineptitude.

If you want to use duty finder as a personal explorer mode, run the dungeon the 1st week it is out when most of the player base does not know the dungeon. Otherwise, watch a video or find three other people/friends who want to spend an hour running a 15 min dungeon.