For what its worth I think it's an effective method for teaching. Now of course the execution of these particular set of videos is questionable, but I think the idea behind it is a sound one. I'm also a very visual learner and seeing things play out is very helpful. The first two videos were on the right track with having dynamic equations that represented the concept being talked about. The third/forth videos didn't seem to have as meaningful of graphics/equations so the benefit wasn't as great.

Also, seeing you in the video was just a distraction. Especially the cuts to maintain verbal flow were jarring because of the obvious visual cut. Just a whiteboard of equations like kahn academy would be better. If the idea here is to overlay graphics over any lecture that would also work, but then you'd have to either switch between live lecture and whiteboard or just have a whiteboard on the side.