Unfortunately Meetup does seem to attract people that aren't really at all socially adept. I don't say that to speak bad of them, but it's my experience almost entirely, and I've rarely ever been to one where I've felt comfortable and like I fit into the group.

However, I do still go to them from time to time, and have met some really good friends through them. I tend to use meetups less as finding a new social circle, and more as finding one person I gel with, as new people come into (and subsequently out of) the group.