Yikes! I'll have to run this by my ex, who is a very, very good middle school science teacher, but I can imagine that what she will say won't make it past the filter.
One thing that stands out to me is that this teacher is using videos a lot. While videos can be useful, they shouldn't be keeping the kids from getting actual work done. You can learn far more from a single experiment than a week of videos.
My feeling is that this teacher is both lazy and disorganized. At this point, I'd be camping in the principal's office demanding a conference with the principal, academic dean, head of the science department and the teacher. And I'd be finding other parents in the same boat to join me. I would *not* worry about retaliation -- start the process now before grades are out. If the teacher retaliates, then you've established a position and you can get her called on the carpet to justify her grading.