I've had mostly bad experiences with dating online. I met one boyfriend on Bear411, really sweet, intelligent, caring guy. We admitted early on that had we not met online, our paths would have never crossed. After a while, the biggest problem was that we just didn't have enough in common. We still found things to do, but didn't share many interests outside of the bedroom, or hanging out watching tv.
That relationship made me really question online dating. If you're meeting someone that you would never cross paths with through the activities that you love to do, do you think you will share those interests? Then again, I also understand that not everyone is looking for someone with the same interests as them. I'm one of those guys looking for someone that's my "best friend, plus sex". I want to be able to get out and do things with my partner, not always go out and do my own thing all day, then meet back up that night for dinner, sex, and sleep. Seems more like a nightly booty call that way.
Now when I use Manhunt, Bear411, or Recon, it's simply for sex. Just like I wouldn't go to a crack house for vitamins, or McDonalds for a salad, I wouldn't go to a hook-up site for a boyfriend. It's just not a good channel for that.