I've been on MN about a week now and am enjoying it enormously. These are my early, fairly random impressions, based on a fair bit of reading (and a small amount of posting) in Mumsnet Talk, largely but not exclusively in AIBU, Relationships, and Mumsnet Classics. I suppose it may be relevant to say that I'm male and quite old.
I've found that:
Lots of threads are extraordinarily funny. Things I read don't generally make me laugh out loud but I have done several times here, for example when reading 'Pointless and soul destroying ongoing fights with inanimate objects'.
Lots of threads are extraordinarily sad, and yes, I've had tears in my eyes reading some of them.
Overall, the quality of writing is of a very high standard. (I was an English teacher a long time ago and I like being impressed by really good writing. I've found that here more than in any other online forum I can think of.)
The kind of support that people give others is tremendous - really heartwarming and moving. There's a wonderful feeling of community - the sort of caring that restores your faith in human nature, particularly when feeling ashamed at the dreadful things some men do to women.
There does seem to be (in some quarters) a bias towards advocating 'leave the bastard' at a stage which seems to me possibly premature. (But there generally seem to be people offering the opposite view too.)
I do feel slightly uneasy about the way I've got caught up in some threads as if they were TV soaps (e.g. refreshing the screen to see if the OP has had THAT conversation with DH yet and what the result was). I have to remind myself that these are people's real lives.
I've learned a number of rather basic but fascinating facts about things bodies do/people do with their bodies. Just one example: that people wipe their bottoms standing up as well as sitting down. (And the shock people obviously experienced at finding people did it the other way from them was funny!)
There's a lot of 'bad language' which I generally enjoy. However, as a man who's long resisted the use by other men of 'cunt' as a term of abuse (because I think the word should be used just for the beautiful part of the anatomy to which it properly refers) I was a bit surprised at the number of women here who use it precisely as a term of abuse. Which is entirely a matter for them, of course, and I'm not saying I think they shouldn't - just that I was surprised.
I think that's quite enough for now. Hope it's of some interest.