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My guess is that selective colleges are sick to death of reading recommendations that are 100% superlatives and effusive with praise and that an honest appraisal from someone who knows you well would be refreshing.
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I'm with Momrath on this one. I have never been an adcom but I have been involved in hiring people for the last 10 years or so ... and during that time a job reference that is "too positive" come off as a sales job and carried less wieght ... and references that seemed even-handed and geniune carried more weight (with me at least) ... I would think that would be a common reaction of adcoms also. (That said, given this teacher is pretty tough I'd only ask him/her if you have met the tough standards laid down)</p>