From Minding the Campus:
It is personally unfair, passes over better qualified students, and sets a disturbing legal, political, and moral precedent in allowing racial discrimination; it creates resentment; it stigmatizes the so-called beneficiaries in the eyes of their classmates, teachers, and themselves, as well as future employers, clients, and patients; it fosters a victim mindset, removes the incentive for academic excellence, and encourages separatism; it compromises the academic mission of the university and lowers the overall academic quality of the student body; it creates pressure to discriminate in grading and graduation; it breeds hypocrisy within the school; it encourages a scofflaw attitude among college officials; it mismatches students and institutions, guaranteeing failure for many of the former; it papers over the real social problem of why so many African Americans and Latinos are academically uncompetitive; and it gets states and schools involved in unsavory activities like deciding which racial and ethnic minorities will be favored and which ones not, and how much blood is needed to establish group membership.