Here is my take on OKCupid. In SF, the real life singles scene is dominated by men. If you go to an event or a bar, there is a lopsided ratio of men to women. The women who are out, are typically insane. The cool women you want to meet are actually on OKCupid because they are tired of being surrounded by dirtbags and nerds (and insane women). So OkCupid works well for a man dating in SF, because that's where the normal, interesting, good-looking women are.
In NYC the scene is the opposite. The bars and events are overrun with attractive women. The weird trolls are the ones hanging out on OKC. Thus, if you move across country to NYC and update your OKC location, you'll start getting tons of messages from tattooed roller-derby girls who have pet snakes. The type you were tired of meeting at the bars in SF.
YMMV, I'll grant that maybe YC has inspired a generation of debonair hackers to move to SF and clean up with all the amazing local women.