One shining beacon (just one)

It's always good to see both sides of the charter school issue, but even in praising one outstanding charter, this article points out that it is the only charter school to outperform the traditional public  schools.  Is one out of every 300 a good enough ratio to justify expanding the number of charter schools?  And do parents really understand that the charters aren't generally outperforming their replacements?

http://www.mlive.com/news/flint/index.ssf/2012/02/some_charter_schools_beating_t.html