My first post on Mumsnet was AIBU to dislike toddler groups, (Ijumped in with both feet) that was three years ago.
It was for all the reasons people suggest.
Down the line I have met a lot of people, feel that this area is now my home, nod to them in the supermarket type thing. Discovered a really, really good circle of friends which has been a great support enjoying the good times etc.
I never did settle down to going week in week out but as your face becomes more familier, people approached me more when I was walking the dog, at the park, swimming, library, etc.
Two of the awful women turned out to have PND but in my sleep deprived, toddler tantrum hell I thought it was all about me actually they were barely coping.
One woman was horrible and from local gossip has always been like that and I shall probably be avoiding her when queuing up for my pension.
I also found that as the DDs changed the groups became better or worse. Sometimes I needed some company, sometimes their tittle tattle over which supermarket drovw me nuts. Naptimes changed, DD started school and DD2 missed her so much she need to feel that stuff was happened for her.
So main thing is
Don't write them all play groups off for ever. The groups change as kids start school & get nursey funding.
Your needs change.
So moan on Mumsnet but no public flouncing