I think the concept of charter schools attracts a lot of people with good intentions. Sometimes that is sufficient to make a quality difference in a given situation.
The concept also attracts a lot of people with not so good intentions, however; witness Gauld's Hyde Leadership Charter Schools. He's tried them in several places, seems to have about a 50% take rate, perhaps less (they close half the time due to parental and school district dismay). Where they have been "successful," i.e., not closed down, is crime-infested urban ghettos where the alternative for kids is so unbelievably dismal that any alternative is gratefully accepted. From their standpoint, Gauld offers them a chance for a different life.
"No-thanks": Gardiner, ME; Oakland, CA; Springfield, MA.
"Here-we-go": New Haven, CT; Washington D.C.; Bronx, NY.
The above list may not be complete. He's tried in someplace in Maryland, yet the website has not been updated for almost a year (after having been in operation for a few months); I'm not sure what's going on there. That school seems to have more of an overt religious influence (vestiges of the school it replaced, perhaps?).
There may be a few other locations as well. Hard to obtain info on the failures. Reference on the internet virtually disappears in those cases.