You answered your own question: Just relax and write. I've found in relationship to writing, there's almost nothing worse then endless editing and feedback. All you do is attempt to respond to that feedback, which can, in many cases, paralyze you into inaction.
That said. Traffic is probably about the only relevant stat, although where someone comes from and the keyword they use is also important.
But the truth is I don't check anything but my traffic, and I've received several million hits on Hubpages with no promotion or social networking whatsover.
Putting up content others are interested in is the key. It's no more complicated than that.