My answer may surprise you! I have a new post up over at Life Without School.
Our kids are missing out on things by not being in school. Good teachers, interesting projects, unique, positive experiences that can only happen in a school environment. While some schools do have their downsides, they also have their upsides. I have heard of some teachers and school-based programs that make me a little jealous and cause me to have brief doubts about what I am doing with my kids.
But what I keep coming back around to is that kids in school are missing out on just as many great things by not being homeschooled. My kids have the opportunity to experience many things that kids in school never will.