Let people figure out that they need to gear up first and actually get down the strategy.

I had several guys who were 1.0 players and said they could "wing it" and ran in without listening to the full strategy.
I also had an Archer pull out of impatience, kill everyone... then the time we all actually attacked, he was the first to die from the first AoE.

I hope it'll get better once the initial rush to "see all content" is over.