I am honestly very disappointed by documentaries in general. Rarely do I find them informative enough or not biased. They are generally made for the masses who know 0 (or even less than that?) about a subject.
If your goal is education, I suggest a book or a course. Now, for motivation and just "time wasters", they are fine.
The one documentary I watched and enjoyed was alphaGo. It was nice feeling the stress of the match and seeing how they handled it, the setups and whatnot.
Communication is, IMO, the most important for a meaningful relationship. I suggest reading the book "Non violent communication" by Marshal.