We're in our second year of homeschooling. My two younger kids are five and seven. The seven-year-old is developmentally disabled and at about the same level as the five-year-old. She did two years of preschool and one in Young Fives in public school before I pulled her out. She wasn't making much progress in the public school, even with spending more than half her day in a special ed classroom.
My two older kids have grown up and moved away, but we had problems with the older boy in the public school too. He was also in special ed and ended up dropping out of public high school as soon as he was old enough. His only options, if he had stayed in school, were a worthless piece of paper saying he attended high school (not a real diploma, I can't remember what they called it), or he could have stayed in school until he was about 22 to get a real diploma. He didn't feel that it was worth it, so he quit.