1) how to properly navigate the map (you look at the template, then at the map, and it's unclear what's what... how do you understand where to run)
2) what tasks to do in the first week, the second week, etc. (what to look for, where to go, who to kill)
3) what else to use... sometimes you see them guessing what's in the Pandora's Box (WTF, how?!), and so on.
It's not very interesting to watch streams without fully understanding what's happening, and most importantly, it's not educational.