The best criticism I ever received was on an English paper way back senior year of high-school. It had to do with something about Grendel, and I had a sentence that was along the lines of, "As has been shown above..." To this, my teacher to my great annoyance circled it in red and wrote, "No you haven't."
That annoyed to me to no end (and still does), but it's probably the single most helpful piece of criticism I ever received. Now whenever I'm writing up a memo, I always think of whether I'm actually backing up what I'm saying, and it's made me a much better writer.
What about everyone else? What is the best criticism you've ever received as a writer?
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