I look a look at Mensa sometime in the 80s in the US, mostly through their publications. I was very underwhelmed-- they had a very bad habit of coming up with a set of plausible-sounding definitions and basing an argument on them.
I went to an event, and I could get at least as good conversation at a science fiction convention.
On the other hand, one of my friends, an intelligent person, was very fond of DC area Mensa, and it doesn't surprise me if there's a lot of local variation. I also know another very smart person who's also very fond of Mensa. Perhaps it's not a coincidence that she also lives in the DC area.
If the best company you've found was a math club, perhaps you should be looking for mathematicians and/or math clubs.
I suspect that local Mensas are different. But I also think that none of them even approaches the LW level. Maybe it's a question of size -- if you have say 100 Mensans in one city, 10 of them can be rational and have a nice talk together, aside from the rest of the group. If you only have 10 Mensans in one city, you are out of luck there.
The mathematician club I was in as a child was one of a kind; and the lady who led it doesn't do this anymore. She has her own children now, and she works as a coordinator of correspondence competitions; which is not the ...
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