[Alex Payne] has an excellent post up titled "Criticism, Cheerleading, and Negativity". It's a 2 minute read, but its worth it:

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We understand well the idea of being in favor or something, or against something, but we don't particularly understand how criticism fits into this dichotomy.

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The reason a person is critical of a thing is because he is passionate about that thing. In order to have a critical opinion, you have to love something enough to understand it, and then love it so much more that you want it to be better. Passion breeds critical thinking.

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“That sucks” is negativity. “That sucks, here's why, and here's how to fix it” is criticism, and it comes from a place of love. That's the difference.

Everyone says they're comfortable with criticism and with critics, because not being able to handle criticism is a sign of immaturity. What people really want, though, are cheerleaders. Nowhere in life is this more true than in business.

A healthy business needs passionate employees to succeed. Critics are the most passionate people you can find, but we're conditioned to assume that critics are negative curmudgeons with nothing more than slings and arrows to contribute. So rather than seeking out critics, employers seek out cheerleaders.

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Read the article.. its worth it..