In order to be successful, it's important to not just get things done, but to get them done well. The desire to be perfect in what you do can help you out immensely — provided that you do those tasks to completion.
This animated radio interview with the late David Foster Wallace stresses how perfectionism can get in your way if you lose sight of that. The relevant stuff is right at the beginning, stick around if you want some insight into the acclaimed author's life.
David Foster Wallace on Ambition [The World's Best Ever]