I think homeschooling is good but it's not the same thing as unschooling.
Unschooling is fully self-directed by the child meaning if the kid wants to play video games from k-12 then that's what they do.
The hope is that the kid will eventually get over it and strive to do more in a more inspired way but I can see how it could be recipe for failure for kids that lack self-discipline and direction. 

 Public schools are unschooling, playing video games all day is no schooling, and homeschooling is schooling. Everything is upside-down.