This site is great for meeting people with similar interests, attributes, or talents that are outside of the interests of the average local bar patron. I have a rare personality type and a 160 IQ which makes it very difficult to meet people that I can have a meaningful conversation with. I started a meetup group and have met some very interesting people. I think that groups that revolve around cleverness have better odds of turning out well because most of the people that show up can have amusing conversations on just about anything.
The much older people, shyer people, or geekier people that show up I just try to include and give them advice on things that they complain about. I like the idea of helping people with what I have learned as much as I do meeting people who challenge me and teach me things.
Most of these people would take me years of pub crawling to meet randomly