Actually, I felt the same as a lot of you folks, especially having met quite a few of the pretentious type. About a year ago, I found myself enjoying the company of 2 men who gave wonderful backrubs and even better conversation. I was thoroughly enjoying their company when they told me they belonged to Mensa, at which I apparently got an "Oh, and you seemed like such nice people." look on my face. Despite this flaw, I wound up going out to dinner with them and various and sundry others and having a wonderful time.
Mensans vary. The group in my current city are neat, wonderful, interesting, unpretentious people, so, to my surprise and amusement, I've joined up because I enjoy the company. I won't pretend to make promises about other cities, but if you're in Ohio or Southwest Pennsylvania, I'd suggest looking up the local chapter and seeing if you enjoy the company. If you do, great. I'll keep an eye out for you. If you don't, I can certainly understand why, and I sympathize.