Share 'The Good, the Bad, and the Utterly Shite'

I was talking to another writer a couple of weeks ago and we were moaning about how neither of us had any real idea if what we were writing was any good or not. He said that he had 'no sense of the piece' (because he's all intellectual and that), while I said that I did: it was all crap. Does anyone else have difficulty knowing if what they're writing is any good or not? Or are we all dribbl...