1) My four friendly readers.
2) My agent.
3) My editor, and sometimes I work with another editor as well.
4) The copy editor
5) The proof reader
That's eight or nine readers, and each time I'm going to be redrafting and fine-tuning. It's hardly surprising that published work is more polished than unpublished stuff. That's not to say we shouldn't aim for the work we submit to be as polished as we can make it - and the first three chapters should be so smooth you could run a silk stocking over them without snagging - but it'll only depress you if you make direct comparisons.