I just went through it with a friend who's not computer savvy at all and has NO history of online gaming other than text based games I understand it's hard to find people like this to test things, a problem they had was when it said unlock the camera and pan over to x area it wasn't very clear for the. The indicator at the bottom next to the minimap doesn't flash very brightly (I suggest a large red arrow).

If someone completely new misses the smallest tidbit they may get stuck, another thing is if they don't do an objective for a long time perhaps the voice should repeat instructions or maybe give a little more in depth ones.