The only online dating site that was worth a moment's time was Facebook, and then they removed the search facility.
OKCupid was interesting, but not a magic bullet. It was then bought by Match, which consists primarily of marketing and poor website construction.
Online 'dating' is a social problem more than a computing problem and, as such, no good solution will ever exist. Anyone male thinking of sinking time into one would be better served by simply getting out more, taking classes, adopt a dog and walk it, etc.