I'm hardly the guy to ask but you did so here goes. I have been happily married for 37 years so take that into account.
If I were single and dating, I think I would find the idea on online dating appealing at least initially. Ultimately, for depth to develop in a relationship, personal contact is needed. By that, I mean the in-person connection. Online dating lacks at least one important quality that God embedded in the human spirit. The need for physical contact. It is inescapable. Being a Christian, of course I uphold the Biblical principal that physical sexual contact is intended for after marriage. However, without the sense of touch, our physical needs in a very important area of human spirituality are left unanswered. We are spiritual beings with physical needs just as God designed us. His intention is for us to have complete relationship. This we cannot achieve across the internet. Obviously, the dangers involved in online dating should be quite clear to all but the foolish and ignorant.