I was on OLD for about 3 years following my divorce, so here's my findings, after hundreds of matches/chats and tens of dates, where I did have fun or I learned and I'm glad I did it...
About 50% of my matches were complete losers frankly - all of the things covered in this thread - only after sex, so dull that they need someone else to entertain them, no ability to hold a conversation, superior, entitled, selfish. Or all of the above. Men who don't realise they're supposed to add value to the woman's life too. No thanks.
About 40% we're perfectly pleasant but we weren't compatible.
About 10% were awesome and I had 3 very very happy fun relationships. Short but that's fine with me, I'm busy.
During those 3 years I was simultaneously building a single life, exploring solo hobbies and holidays, enjoying my friendships I already have with women.
So, now I have a choice.
Do I want to spend 10 hours of my disposable time for one hour of enjoyment?
And my current answer is no. I would far rather spend that 9 hours indulging in the pleasures I already enjoy.
I might change my mind when my dc are older and I have more disposable time on my hands.
But for now, I join the ever increasing number of middle aged women who are simply happier single.