So, overall, I don't think there is a theoretical argument against charter schools as a whole, but there is one about the conception of them in the charter school movement. (balloon-juice.com)
By contrast, results for charter schools as a whole in New York City were unremarkable. (educationnext.org)
Not only are most receiving an inadequate education, but also the sheer size of the group skews the perception of performance of charter schools as a whole. (educationnext.org)