Why should I or anyone else, who actually wants to experience the game and the hardships and fails with it, watch a youtube vid before entering a dungeon? Where is the fun and the actually progression in that?
In the end we vote-kicked that guy and yes, we may have wiped a few times, but we still did it and had fun learning the mechanics.

example 2: Braflox HM, we had a healer who wasn't really highly geared, the first argument form another DPS was that isn't going to end well. He then started to complain about the tank (who was actually aware of the healer not beeing geared for big pulls) not pulling big enough crowds. He started to throw a fit that we progress to slow. To prove a point the tank pulled a huge crowd which eventually wiped us because the healer couldn't really keep up. The DPS left even before the second boss, he rather waited for another 20mins in the queue, losing some myth, just because we couldn't move on fast enough!