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You want to be in a movie where your part works. That's the main thing. No matter how you beat yourself working on the thing, if it doesn't work, it doesn't work.

"Jeff Goldblum Talks THE GRAND BUDAPEST HOTEL, Being Part of Wes Anderson’s Universe, Preparing for His Role and Its Challenges, MORTDECAI, and More". Interview with Sheila Roberts, collider.com. March 20, 2014.
You want to be in a movie where your part works. That's the main thing. No matter how you beat yourself working on the thing, if it doesn't work, it doesn't work.