As usual, I agree with what has been said by AyeRobot, HerBe, startAfire, dittany, etc.
I don't post a lot here but I do read a lot and I see the same thing happening over and over again. Often posters do come to this section in quite an adversarial manner - they question the need for feminism, tell us we are doing it wrong, taking it too seriously, tell us we are mad, tell us the section serves to men bash. And we are expected to a) Indulge these posters b) Water down our views c) Be graceful and saintly about said behaviour otherwise we will 'put people off feminism'.
For some reason the regular posters on the feminist board are held to a standard of behaviour that the rest of MN is not (including those who demand this standard).
Fact is, feminism makes people uncomfortable because it rocks the status quo boat, rejects mainstream thinking and causes women to face up to some pretty unpleasant realities. I think feminists are often attacked in a 'shoot the messenger' sort of way.
Just look for example at the PIV thread. Sakura brought a really interesting perspective to that thread and yet many posters tried to shut her down because they, themselves, could not comprehend where she was coming form as the thinking behind her posts was just too far out the patriarchal box for them. Surely we should be protective of a small space on the internet where non-mainstream ideas can be explored? We don't have to agree with all of those ideas or start living our lives by them but we equally shouldn't be threatened and rendered aggressive by the mere discussion of them.
In addition there is the issue of what level of blaming you are on. People who read the I Blame The Patriarchy blog will be familiar with this concept. This blog clearly states that is is for radical feminists who are quite advanced in their feminist analysis - it is stated in the comments policy that men are not really welcome and that fools are not suffered gladly. Mumsnet is not a blog, of course, it is an open forum and there are no rules about who may post or if they are required to hold feminist views or not - and that, of course, is exactly as it should be. Both sorts of spaces have their value.
However, I do think the less advanced blamers on here should sometimes be a little less attacking of more advanced blaming and I think the more advanced blamers should be careful not to dismiss newer posters who are starting off on their feminist journey.
To answer the OP - this board was set up in the spirit of being a place where people could discuss feminism and discuss issues from a feminist perspective. A feminist perspective is one where it is taken as read that society is male dominated and that women are oppressed by said society. As a general rule of thumb, feminists want the end of female oppression.
A feminist perspective is not 'any perspective at all as long as it is held by a woman'.