Most Helpful Girl
The fact that it's impossible to really get to know someone, and getting to meet them face to face seems hard, too. The way online dating has been designed to work is too superficial. It's also frustrating that people are there with so many different agendas and most of them aren't looking for the same things.
Most Helpful Guy
How women would only have face pics on her profile, having a profile with almost no typed content in it.