Well, whatever the formula, you got to to read this whole thread.
I was very hesitant to post any of my stuff after seeing what the members here are capable of skill wise, and after a 20 year layoff from any type of building.
But I was pleasantly surprised at the response I got, generally postive. I am pretty thick skinned, but I certainly don't want to read "you suck" without any explanation. I know I am not ever going to win a trophy with my builds, that's not why I build anyway, I will probably never enter a contest. But I do take some pride when someone whose work I have seen notices a small touch or a technique that I tried out.
Like Huxy, I always activiely request feedback, and oftewn pepper my WIPS with specific questions, "too much mud?" etc.
As far as commenting, there are guys I seem to have gotten to know, either by pestering them with questions, or simply by posting on their builds, and they in mine. So I generally check in on their posts, and keep my comments light and positive.
Criticism from me is generally an underhand beach ball, but I certainly owe honesty, if I missed a huge mold line and someone points it out, I am grateful, and that's why I would post similarly, but it's all in the delivery.
Some guys seem to hit and run, always negative, and in an abrupt way. I haven't attracted that negative attention myself, though.
Bill