didn't even watch a single lecture
Therein lies the problem. I don't want to watch a fucking lecture. I don't want to slow down to the speed at which someone speaks. I can read much faster then someone can speak. I would greatly prefer to just read the material instead of watching a video. My mind will wander if I have to watch a lecture, since it is not being supplied information quickly enough. An occasional video that demonstrates something specific is fine, but not a lecture.