I joined POF 2 years ago out of desperation. I had tried other sites (such as meet me, okcupid, match, etc.). I'm a divorced mother with 2 full time jobs and had been in 2 very abusive relationships. I didn't have time to look out in the "real world" for a relationship, and honestly I was quite gun shy because of my past relationships.
For the first 8 months or so I had nothing but bad luck. Guys only looking to hook up. But I didn't give up. Finally ran across a profile that peaked my interest (had similar likes and his profile seemed very genuine) and even though I never would have approached him in person because I felt he was way "out of my league", I took a shot, and messaged him. Now as of tomorrow we will have been together for a year. He is everything I have dreamed of for a significant other. We never fight and he truly treats me like a queen. Not to mention my daughter absolutely loves him and he reciprocates her adoration.
I guess my point is that, if you're willing to put the time in and weed out the losers, you can have amazing luck in finding the right person. Just like any other dating site, there are people who aren't honest and are only looking to hook up. But there ARE genuine people out there truly looking for their one "fish". Just like in the "real world" online dating is a series of trial and error. Don't give up!