Well, that's another issue. Unfortunately, most of the teachers don't really known how to teach and keep the students engaged. Putting the same crap they perform every day in the classroom on video doesn't really help anything. Very often it is not even their fault - they weren't actually shown how to teach in the first place!
That may sound surprising, but university teachers rarely get any pedagogical education/training - mostly if you have a degree, you are assumed to somehow know how to teach. So you do what you have seen your teachers do. And it sucks - perhaps your teachers sucked already and even if they didn't, you are certainly not them, only parroting what you think are their methods. Contrast this with highschool/elementary school teachers where pedagogical training/education is mandatory part of the qualification (at least in the most of Europe).
I was lucky to have been offered a training and it did help me a lot - intuition and flying by the seat of your pants can get you only so far. It isn't fair to the students neither. However, we were pretty much the exception and not the rule - most of my colleagues never had that training and some didn't even consider it useful ("I am teaching for 20 years, so I know how to teach. Waste of time!"). Guess who had most of the complaints. And some of these were the most ardent proponents of video lecturing and MOOC, thinking it will free them from the teaching.
On the subject of these e-learning and MOOC systems - I think that these are more a fad to sell the software to the universities and training institutions than anything actually useful. There is lack of any hard data and statistics showing that it is actually effective. Unfortunately, as is often the case, the concept was designed by a businessman or a programmer somewhere, not an actual teacher. Those are usually the last ones to be asked - the system gets bought, installed and then you are told by the university powers that your classes get videotaped and will be put in it. Geee, thanks. Even lecture over video conference system requires special preparation, a fully non-interactive class must be organized and done completely differently than a normal one if there is to be at least some chance for it to work. Right now it is more a money grab by the vendors than anything actually useful, apart from getting the content accessible for more people.