It's not black and white, as these things never are.
There are some really positive things about mn - the feminism and politics discussions for example, which I just don't think you can find anywhere else.
The alcohol support threads, and early days parenting threads, for example, are also clearly a lifesaver for many.
However, a vast majority of the rest of the content is either repetitive, apparently made-up, or just pure bitchery and moaning.
And this brings the overall feel, usability, and trustworthiness of the whole site down.
@NoSauce Had a good list back at the top of the thread of the constantly rehashed threads, my list would go something like - my husband is abusive but I love him and won't leave - I hate my MiL/SiL/boss/neighbour - I think my DH is having an affair (LTB!) - man I met on OLD seems odd after 3 dates - line eyes- etc, etc, etc.
(Worst ones for me are the pointless negativity breed: I hate this DJ / food / music / book / site. Well, don't fucking listen / eat / play it / visit it then!).
I think the level of boredom with these threads is clearly shown in the way the majority of them end up missing the point, and descending into in-fighting and bickering over semantics.
Has it had its day? No, it has huge value in certain areas.
Could some aspects of the site be improved? Almost certainly.
If we want to use it to find interesting discussions, and to give good advice and help to others when they need it, do we have to put up with probably a majority of threads being utter crap? It seems like the answer to this is yes, at least for the time being.