I use content explorer to prospect for guest posting opportunities. Here are 2 problems I constantly face:
  1. It pulls a ton of web2.0s, majority of results are web2.0s. I tried adding a traffic filter (started with 10) and it helps but then it removes the good prospects as well and it still pulls in web2.0 and leaves you with very little options. And yes, I do use DR, in title search, link one per per domain etc. I'm very familiar with it all
  2. When I search for health and fitness sites, through content explorer for guest posts, it pulls a ton of porn related sites.