I've honestly been on OKC (OK Cupid) for a little over a year now. I've met some really kickarse people, some a-holes, and just people who I got a bad vibe from. The best advice I have for you is to let people know up front on your profile what your values are, that you're not looking for sex first cracker out of the barrel. I personally think that the site's worth being on, just look for a friend first, and a relationship later. It's worked for me!