I’ve been a Mensan for 25 years. I met my fellow-Mensan husband at a Mensa party. While Mensa does have a higher-than-societal average of underachievers, big freakin’ libs, and rather astoundingly obese people, mostly it has a bunch of people who think for themselves, do it rather well, and are driven to seek the company of same.
For those who joined and never went to a meeting, or who joined and went to one meeting, I will mention that local groups go through fluctuations, and sometimes for what is usually a limited period of time the group dynamic can become toxic. I joined right after grad school and went to one meeting — where I was either ignored or patted on the head. Annoyed, I didn’t go back for a few years, but when I did, I discovered that the irritating members I met at that party had all gone on to other activities, and the remaining members were mostly very nice and interesting people. Since then I’ve been a very active member, and made lots of friends. Mensa is largely what *you* make of it.