If this is your first time in a dungon...

[Orophin]

I think it's better to educate people about what to expect rather than letting them remain ignorant and possibly be a detriment to the group. There's a notification at the beginning of every dungeon whether there's a new person or not, so it shouldn't come as a shock whether you have someone new to the dungeon or not.

[Khaade]

I like to give a quick scan over a dungeon outline before I run it. But I also tell everyone it's my first run and to let me know if there's things to look out for. While I haven't done many runs, I haven't yet had anyone who wasn't willing to oblige on details let alone get mad and quit. I can only remember dying once (aside from primal fights) and it was in the <2% of a boss' life.

[Caar]

I disagree with you OP. BUT I miss in some cases myself and some people learning stuff by themselves.
Example: on the first time on titan normal, I didnt know anything, I was with 2 friends and a tank from DF. He asked if it was anyones first time and I said me, he proceeded to write all the strategy and a friend spammed like crazy so I dont read because he knows I dont like things spoiled. The tank was psyched to finally find people willing to learn stuff BY PLAYING THE GAME, sure I fell twice but then nailed it, we had an awesome tank as player and in personality.

Same thing happened with the last boss on Qarn, learnt stuff on our own and felt so much more gratifying than someone telling us.