Richard, as someone who is quite happy to admit I met my husband on a dating site, all I can say is that in order to find him I had to kiss (or encounter, at least) a certain number of frogs and toads. There were a lot of totally unacceptable individuals on the dating sites, many of whom made a lot of noise about themselves, and I was lucky in finding my true love on his first or second visit as he was already thinking it was the wrong place for him to be. I had stuck with the site because I had found, among the various frogs and toads, a fair selection of good and congenial people who became my friends.
Which is much the same as life in general, when I come to think about it. Just as I wouldn't expect to find many bosom buddies by standing in the High Street - the internet is just another aspect of Real Life. I developed a set of criteria by which I assessed each new "candidate" ... and I was amazed at how many men managed to "forget" essential data such as attached wives, even though I always made it clear I didn't want to meet anyone with current partners.
I am, however, delighted to say that my husband not only passed all of my assessment criteria but surpassed them all (and continues to do so) and that I obviously passed his quality test as well. We would never have met without the internet, despite having many interests and several acquaintances in common. And I'm not ashamed in the slightest to admit to how we met.