I find that with any good run on a show with good writers, they put something on paper, and you put something back on film, and that affects what they put on the paper the next time.
To try to create a character without a whole lot of information can be taxing. At the same time, it's fun to just stay on your toes and let the next bit of dialogue come in, and turn the page as you read the next script and see what they have in store for you next.
I came up in the theater, and I learned pretty quickly that reading a review, whether it's good or bad, can strangely affect the next performances, because you're reacting to something that's been said about you. So I tend to avoid that stuff pretty studiously.
I still take way more jobs than I turn down, and the reason that I turn down a job is that I just can't find anything in it that charges me or excites me or challenges me about moving to the next phase of where I'm headed.