It's already almost 10:30 and bedtime, so I'll just leave you with some quotes from this NYT article.
"And when parents are told that their children's skills will slip without summer homework, we have to wonder: if those skills are so fragile, what kind of education are they really getting?"
"Most studies have found little correlation between homework and achievement (meaning grades and test scores)..."
"... many [teachers] told us homework assignments are an 'afterthought'."
That last one makes me glad I missed out on experiencing homework till college. If I ever teach, I'd rather skip homework altogether than waste my students' time and neurons.