Do critics help the world?

Thank you for the great comments!
Please answer any number of the following 4

1- Do you believe in using critics as fuel to push your own efforts forward? Shoving success in the critics face.
2- Do you believe in the statement “the greatest source of learning often comes from our harshest critics”?
3- How do you view the quote “the world is happy to give you their definition of failure” as it relates to criticism?
4- What viewpoints do you have regarding the subject of criticism?


Extra reading bellow:
JK Rawling of Harry Potter fame inspired #3– Did you know that was from JK Rawling during her speech to Harvard?

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http://www.youtube.com/watch?v=nkREt4ZB-ck