Video tutorials on as many topics as possible, in a good overall lesson structure, would improve the use of Blender and attract more users, which I know there are some members here who would like to see (true, many also think it’s dumb to focus on getting new users all the time, but hey, it’s a choice). It is not without reason that most 3D pro packages announce their new features with a video tut; it’s a nice way to learn.
The problem with Blender is that it’s not a pro package (‘pro’, professional, means it is made specifically for profit and profiteering; Blender is not). Hence, documentation is whatever gets made when someone feels up to it. That’s how Open Source works. I, for one, hope someone feels up to doing video tuts on the GE at some point. I am slowly getting the hang of making video tuts myself, but I know squat about the GE, so it’s not going to be me, for now.