The Butler campus was actually in the top tier of the PCSB's most recent ratings (in company with Haynes, CapCity & Two Rivers.
Any stain on its reputation comes from other campuses run under the same charter. Other schools run by the same program scored abysmally and are in danger of being closed--and the problem is, since Butler is run under the same charter as these poor performers, the current charter law puts Butler & other good schools under that charter in danger. I know that the administration has voluntarily closed at least one problem campus; I believe they have the sense to work with the board to save what works and cut loose what doesn't.
Given Butler's good performance, I'm really surprised at the lack of sufficient applications for a lottery. It makes me wish I'd thought to apply for K.