Good compared to what? Compared to other developed countries, compared to what they could do if they spent their resources more wisely, compared to what you could do homeschooling your kid? A lot of the criticism of US schools is based on the first two criteria, but the third one should be the one that matters for you - even if they do a crappy job compared to Europe or Canada, they might still do a better job than you on your own, especially if you take into account things like learning to get along with peers. (That being said, I don't know enough about either your situation or even US schools (I live in France), I'm just wary of the jump from "schools are bad" to "I can do better than schools")