Not often you can have a good look at what biology has to say on a lot of social issues at once. This is a great documentary, especially for those who are studying social studies and unfortunately have their world view shaped by what they study.
I thought the male/female stuff was the most convincing and having looked into this myself the evidence for that stuff is MUCH more solid, so the episodes "the female/male paradox", "violence", and "sex" are the most robust scientifically speaking. While I like the overall Idea of injecting biology into all these topics, it must be said that the evidence for these topics varies TREMENDOUSLY. The sex and violence as biological affinities that are relevant to gender are almost natural laws equivalent to gravity at this point. On the other hand some of the later episodes rely on much flimsier stats(such as the gay one), and while I don't disagree with the premise, its easy to get misguided in thinking that because the previous topic is so robust, that the following one will also be of the same standard.
Technically, it is unimpressive and quite dull to be honest, and that's the only reason I give it a 9 instead of a 10.