Almost everyone has been in the situation of entering a duty blind and not knowing what to expect, no one is perfect and it takes a few seconds to write a couple of things in terms of mechs. If the player learns and actually uses that knowledge then great, if they don't then yeah that can be a problem but no amount of watching a video is going to change how someone plays. Best advice if you do not like the matchmaking, queue up premade with friends or even use the Party Finder.