So the problem is that there is a huge grey area between single pulls and speed run. I've been running CBMHM A LOT (zodiac) as a tank as that is the quickest queue. When I get a new person bonus I almost always pull everything anyways except for that last set with the 2 frogs, 3 colbyn, and 3 giants. Other dungeons I will pull 2 at a time if there is a newb, etc. The problem is usually bosses, as new players can actually wipe the whole group with ignorance (I am not saying that in a negative way).

IMO, its the new players responsibility to ask for instructions. In my opinion, no 4-man dungeon boss in this game is too hard to get on your first try if the other 3 people know what they are doing. I have never failed to grasp a 4-man boss mechanic after seeing it one or two times, and I am going to get everyone the benefit of the doubt that they have an average or above average ability to preform - I don't want to insult your intelligence or ruin your immersion by spoiling boss mechanics.

The title of this post is accurate, and the OP got a little too salty in the text - If you are new, SAY SO. It will be so so so much better for everyone.