I met my wife on tinder and we have been together nearly 7 years now but it's definitely an outlier. I literally signed up when out drinking on a Friday night and spent one weekend on there. Spoke to her and one other girl. I gave my wife my number (didn't with the other girl) and told her I was deleting the app and she could text me if she still wanted to talk.
She said she had been on and off for 2-3 years and it was hellish and she had long given up on actually meeting someone worthwhile on there.