I know exactly what you mean and YANBU. I find some of their threads helpful, insightful, educative and fascinating, but it is almost always spoilt by threads that make my eyes roll so far back in may head it's a wonder I can read them at all, and they leave me with a negative overall impression of the entire topic.
I also dislike the way there is no room for debate there. They seem only interesting in a nice submissive, pliable audience to teach or preach to. Anyone daring to question them or raise a counter-argument is soundly stamped on and shouted down immediately, and rigorous analysis of any of their posts/links is viewed as misogynist trollery.
They seem to have become confused with the idea that the Feminism board being 'a safe have to discuss feminism' actually means 'this is our own private clique topic where you are only welcome if you agree with everything we say.'
It's a bit like me and a hardcore group of parents who use private education taking over the Education topic, and saying that as our DCs are privately educated we are only willing to engage with other parents who have made the same choice, and from now on, anyone who wants to come on the Education topic must be prepared to do it from the perspective of believing that private is best. Not sending yours private, or wishing you could? Then you are entitled to comment on any aspect of education at all.
That is how the Feminism section comes across to me.