I have not seen the movie but have read about it. Research has not found that charter schools on average outperform public schools, as discussed at
http://www.newsweek.com/2010/06/13/understanding-charter-schools.html . KIPP charter schools have a good reputation, but I think much (but probably not all) of their success is due to the attrition of weaker students
http://voices.washingtonpost.com/answer-sheet/charter-schools/myths-and-realities-about-kipp.html . The movie's famous lottery scene is wrong to suggest that the losers are doomed to get a much worse education in a conventional public school than they would get in a charter.
I support charters and especially vouchers, which let parents spend the educational funds largely as they see fit, but the claims made for these reforms are exaggerated. The differences in average academic achievement across various schools largely reflect the differences in average intelligence across schools, but no politician or educational policymaker wants to acknowledge that.
