OKC has the worst matching algorithm on the Internet. I signed up for an account, spend a large amount of time to get my profile "100% complete", answered over 1,000 questions and was still consistently matched with people I had absolutlely no interest in dating at all. I can't count how many times I saw 0% compatibility scores, people hundreds or even thousands of miles from me(I'd specifically said no more than 30 from my zip code) and worst of all, several men(I'm not gay and didn't express and desire at all to meet men on the site). I deleted my profile after 6 months and when they asked me why I was leaving I told them how their matching process would be better using a random number generator. It's too bad because OKC is one of few free dating sites I know of that actually has a decent number of women using it.
That doesn't sound like a bad matching algorithm, it's more like you found a bug on the search form: distance and sex are presumably filters in the query, not input to the matching algorithm. And it sounds like a rare bug too, since if a lot of people were getting results of the wrong sex that would quickly become an issue.
I may be being harsh, but the comment sounds like a troll to me; he's describing horrendous, show-stopper bugs like failure to respect basic search filtering criteria which the apparently large number of HN readers with accounts on OKC have failed to report. I don't find the post in any way credible.
