Threeangels, I am in the UK. I know nothing about the schools in the US so I cannot compare, but certainly the schools around me are not the sort of places I would want to send my children 6 hours a day, 5 days a week. The children leaving them are described as "well below average" in most subjects and the behaviour of the kids doesn't even bear thinking about
I know some people working from set curriculums at home but I prefer the idea of working without. I just feel it leaves the way open to more opportunities which may arise on an everyday basis.
I think you made an important point about values. I am not religious, but I have strong beliefs and values (environmental, particularly) which I don't feel are given enough priority in school.
An added point is that both my children are showing signs of being very bright, and I don't feel that enough provision is made for any other than 'average' students (who are they?). The more gifted students are bored, the less able, frustrated. I know attempts are made to remedy the situation, but I don't feel its enough. Educating at home leaves the way open for their needs to be catered to, rather than skirted around.