I'll never understand why some writers do this. As a writer myself, it makes me nervous to think that someone would send out their work as soon as the word 'FIN' leaves their fingertips.
There are a couple of famous sayings that often get circulated in reference to this very point - they recommend throwing your first draft either in a drawer or the dustbin (depending on how ruthless/cynical/sadistic the advice-giver is). And as much as it pains me to regurgitate these well-worn words of writing wisdom, I'm inclined to agree.
It took me a while to take this advice on board; I felt like maybe I was the exception to the rule, maybe my first draft is the equivalent of other people's fiftieth. Maybe I was an idiot.
So don't send your first draft, don't even send your second. Send the final draft. The one that you're really happy with - in a month's time, in two years' time, in ten years' time.
That's the script I want to read.